the complete question is
A school purchases boxes of candy bars.
• Each box contains 50 candy bars.
• Each box costs $30.
How much does the school have to charge for each candy bar to make a profit of
$10 per box?
step 1
charge for each box $10
so
the new box cost $10+$30=$40
step 2
divide the new box cost to total candy bars
$40/50=$0.80
the answer is
the school have to charge for each candy bar $0.80