A medicine has 60% substance S and 40% substance T. If the cost price of S is increased from ₹30 to ₹40 per unit and the cost price of T is decreased to ₹20 from ₹30 per unit, then the cost of the medicine will _____ by _____%.
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Correct answer: D
Explanation
The correct answer is option 4 i.e. increase; 6.67.
Medicine has 60% S and 40% T.
Old cost:
S = 0.6 × 30 = 18
T = 0.4 × 30 = 12
Total = 30
New cost:
S = 0.6 × 40 = 24
T = 0.4 × 20 = 8
Total = 32
Increase = 32 – 30 = 2
Percentage increase = (2 ÷ 30) × 100 = 6.67%