Total sum for Policy A = 334
Total sum for Policy B = 357
Total sum for Policy C = 338
Less expensive policy is =334
Most expensive policy is = 357
[tex]\begin{gathered} \text{percentage increase is =}\frac{357\text{ - 334}}{334}\text{ }\times100 \\ \text{ =}\frac{23}{334}\times100\text{ =}\frac{2300}{334}\text{ = 6.88\%} \end{gathered}[/tex]