## Basic College Mathematics (10th Edition)

We know that this year there was an increase in shark attacks by $25.4\%$ (out of 63 last year). We can calculate this amount with a ratio: $\displaystyle \frac{25.4}{100}=\frac{x}{63}$ Cross-multiply: $25.4*63=x*100$ $1600.2=100x$ $x=16.002$ $x\approx 16$ Thus this year there were 16 more shark attacks. Therefore, the total was: $16+63=79$