Correct Answer - Option 4 : Rs. 168
Given:
Consumption of cough syrup in a day = 2 teaspoons × 3 times = 6 teaspoons
Number of teaspoons in a bottle = 90
Calculation:
Consumption in 20 weeks = 6 teaspoons × 7 days × 20 weeks = 840 teaspoons
Number of bottles needed for the consumption = 840/90 = 28/3
∴ Cost of medicine at current price = 28/3 × 18 = Rs.168