10% of 300 + 20% of 150 equals: MCQ with Answer and Explanation

Explanation:
0.35 × 240 = 84.

Explanation:
Original x, xy=120. New 0.8x(y+5)=120 → 0.8×120 + 4x =120 → 96+4x=120 → 4x=24 → x=6, reduced 4.8? Wait: original x=6, reduced price = 0.8*6=4.8, option C. Check: original 6 per kg, 20 kg for 120. Reduced 4.8, buys 25 kg for 120, 5 kg more. So reduced price = 4.8. Option C. So answer C.

Explanation:
CP of 1 article = 8/10 = 0.8, SP of 1 = 10/8 = 1.25. Profit = 0.45, % = (0.45/0.8)×100 = 56.25%.