At the End of April, Brad Had $7,500 in His

At the end of April, Brad had $7,500 in his daily interest savings account. On the 13^th of May he deposited another $3,500. He made no other deposits or withdrawals in May. The simple interest rate throughout May was 3.7%. How much interest did Brad earn on this savings account in May?

A) $16.83
B) $30.31
C) $21.99
D) $39.52
E) $46.17