Answer:
$570,000
Explanation:
The calculation of amount of sales is shown below:-
Contribution = $520,000 × 40%
= $208,000
Fixed cost = Contribution - Profit
= $208,000 - $70,000
= $138,000
Revised fixed cost for next year = Fixed cost + Increased Fixed expenses
= $138,000 + $10,000
= $148,000
Amount of sales = (Profit + Fixed cost) ÷ Contribution margin ratio
= ($148,000 + $80,000) ÷ 40%
= $228,000 ÷ 40%
= $570,000