First divide the commission by the number sold:
225/5 = 45
300/8 = 37.5 since the commission is a different amount it is not just multiplication so the last two answers are not correct.
Since for 5 the commission was 45 but for 8 it was less than 45, the equation can’t use 45 as a multiplier
The answer has to be E= 25s + 100