Chin operates customizing service for an iPhone 7 series. A typical customized iPhone might have a custom color case with blinking lights and a personalized logo. The cost to refurbished t units of iPhone 7 series in a month is calculated to be; TC (t) = 1500 + 50t + 0.35t². He charges customers RM250 for the work on each iPhone 7 series.

(a)Calculate the marginal revenue and interpret the result.(4 marks)

(b)Find the profit functions.(3 marks)

(c)If Chin managed to refurbish 26 units for this month, compute the following:

i.revenue(2 marks)

ii.marginal revenue(1 mark)