The student union at Cavendish University Zambia is selling union branded

T-shirts to students at 50 Zambian Kwacha (K50.00) per T-shirt. They

must have a guarantee of selling 150 T-shirts. Furthermore, they agree that

for each T-shirt in excess of 150, they will reduce the price per T-shirt by

K0.04. How many T-shirts will it take to maximise the revenue?

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )