1.(a) If the demand function of a good is given by P = 80-3Q find the price when Q = 10, and deduce the total revenue. (b) If fixed costs are 100 and variable costs are 5 per unit, find the total cost when Q = 10. (c) Use your answers to parts (a) and (b) to work out the corresponding profit. 2.Given the following demand functions, express TR as a function of Q and hence sketch the graphs of TR against Q: (a) P = 4 (b) P = 7/Q (c) P = 10 - 4Q​