3) Mobius collects jet ski calendars, which cost $5 each. He also likes to have money to spend on other things. We can write his utility function as: U(C, D) = 100% + D where C is the number of calendars he buys and D is the number of dollars he has to spend on other things. (Each dollar has a price of $1) Mobius has $20. a) How many calendars does Mobius want to buy? b) Suppose the price of calendars falls to $1, how many calendars does Mobius want to buy? c) Derive and plot Mobius' demand curve with price p per calendar. (1) Let the price be $5 again, but now Mobius has $40. How many calendars does he want to buy? e) Calculate and plot Mobius' Engel curve with income Y. f) Does the shape of Mobius' Engel curve depend on the price of calendars