Answer:
$262.50 increase
Step-by-step explanation:
10 % = 0.1 (move the decimal point 2 place to the left)
$31,500 x 0.1 = $3,150
$3,150 + $31,500 = $34,650
$31,500/12 = $2,625 a month
$34,650/12 = $2,887.50 a month
$2,887.50 - $2,625 = $262.50 increase