Petes Pets sells about 1,000 snakes a year. It currently sells snakes for $30 each, which includes a $10 markup. However, they are switching to a new supplier, which can supply the snakes for $15 each. If Pete wants to keep the same markup percentage, how much will snakes now cost his customers?

A : $25

B : $22.50

C : $20

D : $17.50