Mathematics

# benny has \$66.00 in his bank account that earns 6% annual interest if he doesn't make any deposits or withdrawals how much money will he have in this account in a year?

$\66\cdot0.06=\3.96\\ \66+\3.96=\69.96$
$100\%+6\%=106\%=1.06\\\\\66.00\cdot1.06=\69.96$