(a)[1]
Calculate the income, in dollars, that Abdul received on Monday.
(b)[3]
On Tuesday, the price per box fell by $10\%$ and the number of boxes sold went up by $30\%$. Calculate the percentage change in the income.
(c(i))[2]
On Wednesday, the price of a box was $y$ cents less than on Monday. Abdul sold $4y$ more boxes on Wednesday than he did on Monday. Write down an expression, in terms of $y$, for the income received on Wednesday. Give your answer in dollars.
(c(ii))[2]
Since this income is $40$, write down an equation in $y$ and show that it reduces to $y^2 + 5y - 50 = 0$.
(c(iii))[3]
Solve $y^2 + 5y - 50 = 0$.
(c(iv))[1]
Hence determine how many boxes were sold on Wednesday.