Overlapping Sets

A certain store sells two models of cellular phones, M1 and M2, and offers two telecommunication programs, P1 and P2. Every cellular phone is sold together with one of the two telecommunication programs. Yesterday, the store sold 8 pieces of the M2 model. In addition it sold 13 pieces of the M1 model together with the P1 program. How many cellular phones (of both brands) did the store sell yesterday?

1) Yesterday, the store sold 20 pieces of the M1 model
2) A quarter of the cellular phones sold yesterday were M1 models sold together with the P2 program

The OA is D

Source: Economist GMAT

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