John has $28, which is \(\frac{1}{13}\) of Kevin's money.

• Kevin = 13 × $28 = $364
• Tim = 2 × Kevin = 2 × $364 = $728
• Total = John + Kevin + Tim = $28 + $364 + $728 = $1,120

The question asks for the total amount the three boys have altogether. The stored answer $364 is only Kevin's amount.

Final Answer: $1,120