240 letters is 80% of
letters

i am assuming that you want to find out the total number of letters.

if so,

let 'x' be the total number of letters

so, 80/100*x = 240

80x/100 = 240

80x = 240*100

80x = 24000

x = 24000/80

x = 300

total number of letters is 300

a manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. at the end of december, the company wishes to forecast sales for january. the estimate of trend through november has been 200 additional boards sold per month. average sales have been around 1000 units per month. the demand for december was 1100 units. the company uses α = 0.20 and β = 0.10. make a forecast including trend for the month of january.

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