Ms$.$ ?Green, an HR manager at the Movie Theater is trying to figure out the weekly take$-$home pay for each of her employees based on three variables: hours $($for the number of hours the employee has worked during the pay period with a default value of $40),$ ?wage $($for the hourly wage$),$ ?and tax $($for the income tax rate$).$ ?In the space below, please define an R function named payday$()$ ?with three arguments $-$ ?hours, wage, and tax $-$ ?to calculate an employee's take$-$home pay.

For example, for someone who has worked $37$ ?hours at $$15$ ?per hour with a $10\%$ ?income tax, your function should return the value of $$499\mathrm{.}50.$