[ Percentage and ratio problems ]

Over the spring, Oblomov lost $25 \%$ of his weight, then gained $20 \%$ over the summer, lost $10 \%$ in the fall, and gained $20 \%$ over the winter.

Did he lose or gain weight over the year?

#
$1.2 \cdot 0.9 \cdot 1.2 \cdot 0.75 = 0.972$. This means, in the end, Oblomov lost $2.8 \%$ of his weight.

## Answer

He lost weight.