Can someone me out i don’t understand math

The question is: If 270 containers were sold by February 1, how much profit did the store make?

Given info:
300 containers total
Cost: $0.79
Sold: $1.55
$0.50 refund (+$0.50) for containers not sold by Feb 1

Total cost for 300 containers is 300($0.79) = $237

Revenue for the 270 containers would be
270($1.55) = $418.5
Revenue for the 30 unsold containers (due to rebate) is 30($0.50) = 15
Total revenue is $433.50

Profit is revenue - expenses
$433.50 - $237 = $196.5