Atafastfoodrestaurant,“roundup”        dollar and donate the additional money to charity. The cashier is instructed to tell the customer that        their bill is X dollars and Y cents. Assume that the values of Y are equally likely to be any value from 0        to 99 cents and that customers are equally likely to “round up” regardless of the amount of their bill.       The density curve below models Y, the donation amount. (a) What is the shape of the distribution of donations?   (b) What proportion of donations are at least 85 cents?   (c) What percent of donations are between 30 and 40 cents?