Matt runs a small business selling donuts. He knows that daily revenue as a function of selling p is R(p)=180p-7.5 p^2 and daily cost in producing donuts is C(p)=800-15p. Matt wants to maximize profits. At profit maximizing price, how many donuts does he expect to sell daily? Assume a linear dependence between demand and selling price of donuts.

A 94 donuts

B 60.5 donuts

C 82.5 donuts

D 75 donuts