In a total investment of $500,000, B's share is 20%, while A's share is 40% of B's. What is A's share?

$40,000

$20,000

$80,000

None of these

Total investment = Rs. 500000

B's share = 20% of Rs. 500000 = 0.20 x 500000 = Rs. 100000

A's share = 40% of B's share = 0.40 x 100000 = Rs. 40000

So, the share of A is Rs. 40000.