Subject: mathqa
Question: the charge for a single room at hotel p is 30 percent less than the charge for a single room at hotel r and 10 percent less than the charge for a single room at hotel g . the charge for a single room at hotel r is what percent greater than the charge for a single room at hotel g ?
Option: 
A: 50 %
B: 20 %
C: 28 %
D: 150 %
Answer: C