Answer:
his contribution margin is $75750
Explanation:
given data
buys = $460
sell = $750
sales commission = 5%
store rent = $7000
pay for staff = $1800
to find out
what would be his contribution margin
solution
contribution margin is express as
contribution margin = sales - sales commission - cost of good sold   .........1
put here value
contribution margin = 300 × 750 - ( 300 × 750) 5%  - 300 × 460
contribution margin = 75750
so his contribution margin is $75750