If number of hats sold on Friday by A is increases by 14${ m{;}}frac{2}{7}$ % , then what will be the average no. of hats sold on Monday, Wednesday and Friday by A?

No. of hats sold on Friday by A after increase = 56 × $frac{8}{7}$ = 64

Average no. of hats sold on Monday, Wednesday and Friday by A

= $frac{{46 + 64 + 64}}{3} = frac{{174}}{3} = 58$