A hippopotamus had a mass of $29.4 \mathrm{~kg}$ at birth.
At two months old, it had a mass of $78.9 \mathrm{~kg}$.
By what percentage did its mass increase over these two months? Give your answer to the nearest $1 \%$.

Answer

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Answer

\boxed{168\%}

Steps

Step 1 ：Find the difference in mass: $78.9 - 29.4 = 49.5$

Step 2 ：Calculate the percentage increase: $\frac{49.5}{29.4} \times 100 = 168.37$

Step 3 ：\boxed{168\%}