Answer:
$3.24
Explanation:
The $3 is reduced by 10%
10% of $3 is $0.30, so you minus $0.30 from $3.00
which gives you $2.70 (he bought it at $2.70)
now he wants to sell it by increasing the price from he bought be 20%
so, you have to find 20% of $2.70, which is $0.54
now add the 20% to the cost price
$2.70 + $0.54
=$3.24