Final answer:
The total cost after 3 months is $605.
Step-by-step explanation:
To calculate the total cost after 3 months, we need to add the initial cost of $500 to the monthly cost of $35 multiplied by the number of months. In this case, we are looking at 3 months, so the calculation would be: $500 + (3 x $35) = $500 + $105 = $605.