I already know the answer, its increasing by 4 but i dont know how to write the answer.

The answer you are looking for is right in front of you it’s c. 3/20

$250 deductible means jane must pay the first $250 of her bill. so the insurance company paid = (80% of bill) - deductible = (0.8 x $2550) - $250 = $2040 - $250 = $1790 and jane's cost is = (bill) - (insurance payment) = $2550 - $1790 = $760