After taking $N$ tests, each containing $100$ questions, John had an average of $70\%$ of correct answers. How muc

After taking $N$ tests, each containing $100$ questions, John had an average of $70\%$ of correct answers. How much does John need to score on the next test to make his average equal $72\%?$

A. $N-35$
B. $N+72$
C. $2N+70$
D. $2N+72$
E. $2N-35$

Answer: D

Source: GMAT Club Tests

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