Answer
a) $53.7\%$
b) $46.3\%$
Work Step by Step
a) From $s=0$ to $0.306m$, there are around 130 squares under the line. Since there are 242 squares in total, the percentage of work done during this period is $$\frac{130}{242}\times100\%=53.7\%$$
b) The percentage of work done from $s=0.306m$ to $0.5m$ is $$100\%-53.7\%=46.3\%$$
