on office equipment sales representative earns a weekly salary and commission on his sales. one week his total compensation on sales of $7000 was $700, the next week his total compensation on sales of $8000 was $740, find the weekly salary and commission rate

Answer 1

treat the data as two ordered pairs of the type
(s,c) where s is sales and c is commission.
so you have (7000,700) and (8000,740)

slope = (740-700)/(8000-7000)
= 40/1000 = .04
so c = .04s + b , (compare with y = mx+b )
for (7000,700)
700 = .04(7000) + b
b = 420

c = .04s + 420

his base salary is 420 and his rate of commission is 4%