Correct Answer - Option 4 : 22 Rupees
Calculation:
Let be assume cost price of mangos, custard apples, and watermelon is p, q, and r respectively
⇒ 2p = 6q, 3p = r
⇒ 2r = 18, r = 9
⇒ p = r/3 = 9/3 = 3
⇒ q = 2p/6 = (2 × 3)/6 = 1
⇒ Now, 4p + 10q = 4 × 3 + 10 × 1 = 12 + 10 = 22
∴ The required result will be 22 rupees.