Harles is paid $3.75 per hour plus time and a half on holidays and makes an average of 15% tips on his food sales as a server at the local seafood restaurant. This is modeled by the expression 3.75(x) + 3.75(1.5)(y) + 0.15(z).

What is Charles' gross pay if he worked 25 regular hours and 5 holiday hours and had $1,915 in food sales?

a
$121.88

b
$399.75

c
$409.13

d
$446.63