The water level of a river increases and decreases by 10 percent on alternate days in the rainy season. What shall be the increase or decrease in the water level at the end of the second day, as compared to the initial water level?
A1 percent increase
B1 percent decrease ✓ Correct
C1.5 percent increase
D1.5 percent decrease
Correct answer: (B) 1 percent decrease
Explanation
The level falls by 1%.
Day 1 rise: factor 1.10.
Day 2 fall: factor 0.90.
Net factor = 1.10 x 0.90 = 0.99.
Change = 0.99 - 1 = -0.01 = 1% decrease.
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