I keep getting an error with my python code i am not sure what is it

[Alphatester123]

Write a program to prompt the user for hours and rate per hour using input to compute gross pay. Pay should be the normal rate for hours up to 40 and time-and-a-half for the hourly rate for all hours worked above 40 hours. Put the logic to do the computation of pay in a function called computepay() and use the function to do the computation. The function should return a value. Use 45 hours and a rate of 10.50 per hour to test the program (the pay should be 498.75). You should use input to read a string and float() to convert the string to a number. Do not worry about error checking the user input unless you want to - you can assume the user types numbers properly. Do not name your variable sum or use the sum() function.

Whenever i type the solve it keep giving me an error i got a headache from it and unable to solve it at all

[priyapp13]

def computepay(h,r):
if h>=40:
pay=r*(40)+r11.5*(h-40)
return(pay)
hrs=input("Enter hours:")
h=float(hrs)
rate=("enter rate:")
r=float(rate)
p=computepay(h,r)
print ("Pay",p)