Problem Solving

The number of people at Ovations Bar in the hour from 12 p.m. to 1 p.m. was 40% greater than the number of people there from 11 a.m. to 12 p.m. The number of the people at the bar from 11 a.m. to 12 p.m. was 25% less than the number there from 10 a.m. to 11 a.m. If 72 people were at the bar from 11 a.m. to 1 p.m., which of the following is the number of people in the bar from 10 a.m. to 11 a.m.?

(A)10
(B)20
(C)30
(D)40
(E)50
OA is D
What is the best mathematical approach to solve this? An Expert contribution will be appreciated.