Answer:
$1200
Explanation:
10 x 100 = 1000
$1000 made last month
30 x 10 = 300
$300 made this month (not including the cancellations)
10 x 10 = 100
$100 lost due to cancellations
300 - 100 = 200
$200 this month
Final calculation: This months income + last months income = total income
200 + 1000 = 1200
$1200 made in the combined months