The population of a town increases by 10% annually. If the current population is 12,100, what was the population two years ago? MCQ with Answer and Explanation

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:
1.3 × 130 = 169.

Explanation:
Second part = 5/(2+5) × 100 ≈ 71.43%.