Answer:
20%
Explanation:
In first case when Purchases were 45% of sales and other expenses were 45% of sales, the profit is = Sales - Expense - Purchase =
Profit = x - 0.45x - 0.45x
Profit = 0.1x
In the next case the profit is = x-0.45x - 0.43x
Profit = 0.12x
Hence, the increase in profit = (0.12-0.1)*100/0.1x
(0.1x) = 2
x = 2 / 0.1
x = 20%
Hence, the increase in profit = 20%