1. A printer costs a price of Birr 1,600 for printing 300 copies of a report and Birr 3500 for printing 600 copies. Assuming a linear relationship, what would be the price for printing 300 copies?

Question

answer only even number

Answer 1

It's a silly question, as it tells you directly in the question - 1600 Birr !!

If you needed to find the linear relationship

(y-y1) / (x-x1) = (y2-y1) / (x2-x1)

(x1,y1) = (300, 1600)

(x2, y2) = (600, 3500)

(y - 1600) / (x - 300) = (3500 - 1600 / 600 -300) = (1900 / 300) = 19 / 3

So crossmultiplying

3y - 4800 = 19x - 5700

3y = 19x - 900

y = 1/3 (19x - 900)