Profit earned on first mobile
= Amount received - Amount spent
= ₹ 10,000 - ₹ 9, 000
= ₹ 1,000
Profit earned on second mobile
= Amount received - Amount spent
= ₹ 11,000 - ₹ 9, 000 = ₹ 2,000
Total profit earned
=Profit earned on first mobile + profit earned on second mobile
= ₹ 1,000 + ₹ 2,000 = ₹ 3,000