# 2005 CEMC Gauss (Grade 7) Problems/Problem 12

## Problem

A bamboo plant grows at a rate of $105$ cm per day. On May 1st at noon it was $2 m$ tall. Approximately how tall, in metres, was it on May 8th at noon?

$\text{(A)}\ 10.40 \qquad \text{(B)}\ 8.30 \qquad \text{(C)}\ 3.05 \qquad \text{(D)}\ 7.35 \qquad \text{(E)}\ 9.35$

## Solution

Since the bamboo plant grows at a rate of $105 cm$ per day and there are $7$ days separating May 1st and May 8th, then it grows $7\times 105 = 735 cm$ in this time period. Since $735 cm = 7.35 m$, then the height of the plant on May 8th is $2 + 7.35 = 9.35 m$. The correct answer is $E$.