EC-451 (650-0893) Operation Faxback Doc. # 7607 Press ON/C CE or AC to turn on your calculator. Use the following examples as guides for entering specific kinds of calculations. Note: If you enter an incorrect value, press On/C CE once. Then enter the correct value and proceed with your calculation. If you press an incorrect function key (+,-,x,/), press the correct key and continue with your calculation. To clear a calculation from the display, press AC. Basic Calculations Calculation You Press You See 256 + 378 = 634 256[+]378[=] 634. 471 - 223 = 248 471[-]223[=] 248. 15.5 x 2.3= 35.65 15.5[x]2.3=] 35.65 17.2/ 2.5 = 6.88 17.2[/]2.5 [=] 6.88 1/8 = 0.125 8 [/][=] 0.125 Mixed Calculations Calculation You Press You See 14 x 25 - 36 = 314 14 [x] 25 [-]36[=] 314 3 x (-3) = -9 3 [x] 3 [+/-][=] -9 Percentage, Add-On, and Discount Calculations Calculation You Press You See 20% of 720 is 144 720 [x] 20 [%] 144. 30% added on to 540 is 702. 540 [+]30 [%] 702. 20% reduction of 800 is 640. 800 [-] 20 [%] 640. Constant, Power, and Square Root Calculations For multiplication, the first value you enter is the constant. For addition, subtraction, and division, the second value is the constant. Calculation You Press You See 5 x 7 = 35 5 [x] 7 [=] 35. 5 x 9 = 45 9[=] 45. 5 x 10 = 50 10 [=] 50. 100 / 5 = 20 100 [/] 5 [=] 20. 200 / 5 = 40 200 [=] 40. 300/ 5=60 300 [=] 60. 7^6= 117649 7 [x] [=][=][=][=][=] 117'649. Checkmark 2 2 [checkmark] 1.4142135 Memory Calculations To store a value in memory, first press MC (memory clear) twice to clear the memory. Then enter the number or calculation and press M+. To add a value to the current memory value, enter the number or calculation you want to add and press M+. The calculator totals the current calculation and adds that value to memory. To subtract a value from the current memory value, enter the number or calculation you want to subtract and press M-. The calculator totals the current calculation and subtracts that value from memory. To recall the value from memory, press MR (memory recall) once. Calculation You Press You See 2392 + 576 [MC][MC] -73 786 - 432 786 [M+] M 786. = -64.61582 432 [ M -] M 432. 2392 [+] M 2'392. 576 [/] M 2'968. [MR] M 354. [-] M 8.3841807 73 [=] M 64.61582 Calculation You Press You See 123 x 45.6 = 5608.8 123[x] 45.6 [M+] M 5'608.8 +)789 x 12.3 = 9704.7 789 [x] 12.3 [M+] M 9'704.7 -)25.8 x 36.9 = 952.02 25.8 [x] 36.9 [M-] M 952.02 14361.48 [MR] M 14'361.48 Markup Calculation The markup function helps you find the selling price based on the cost and the desired gross profit margin, and also lets you determine the gross profit margin when given the cost and selling price. The gross profit margin is the percentage of the selling price that is profit. For example, if you sell an item which costs you $100 for $125, the gross profit is $25, and the gross profit margin is 20 percent. Price - Cost (Profit) = Gross Profit Margin Price Given an item that costs $100 what is the selling price and profit for a gross profit margin of 20%? Calculation You Press You See Cost = $100 100 [MU] 20 [%] 125. Margin = 20% Price = $125 Profit = $25 [MU] 25. If you deposit $12,300 each year for six years at 6% annual interest, the annuity amount at the end of six years will be $85,796.39. Calculation You Press You See Annuity Calculation 1 [+] 0.06 {x][=][=] (1 + 0.06)^ 6- 1 [=][=][=][-]1[/] x 12300 0.06 0.06 [x] 12300 [=] 85'796.394 = 85796.394 Given an item that costs $127 and sells for $219.50, what is the gross profit margin? Calculation You Press You See Gross Profit Margin Calculation Cost = $127.00 219.5 [-] 127 [MU] 42.14123 Sell = $219.50 GPM = 42.14123% CALCULATION ERRORS E (error) appears at the lower left of the display when: A calculation result exceeds eight digits (see "Estimating Calculation Results"). A memory calculation exceeds eight digits (the memory contents remain unchanged). You try to divide by 0. You try to calculate the square root of a negative number. If E appears, press, ON/C CE to clear the error. Then re-enter the calculation. Estimating Calculation Results If you perform an operation that results in a calculation which exceeds eight digits, you can estimate the correct result (to eight significant digits) by following these steps. 1. Count the number of digits displayed to the left of the decimal point. 2. Remove the decimal point. 3. Add to the right of the number as many zeros as there were digits to the left of the decimal point. For example, If the display shows E1.0142064, the approximate answer is 101.420,640. (br/all-9/19/94)