At the end of April, Brad had $7,500 in his daily interest savings account. On the 13th of May he deposited another $3,500. He made no other deposits or withdrawals in May. The interest rate throughout May was 3.7%. How much interest did Brad earn on this savings account in May?
▸ $16.83
▸ $30.31
▸ $21.99
▸ $39.52
▸ $46.17