Keith$$s Sheet Music needs a program to implement its music teacher$$s dis$-$

count policy. The program is to prompt the user to enter the purchase total

and to indicate whether the purchaser is a teacher. The store plans to give

each customer a printed receipt, so your program is to create a nicely format$-$

ted file called receipt.txt$.$ Music teachers receive a $10\%$ discount on their

sheet music purchases unless the purchase total is $$100$ or higher. In that

case, the discount is $12\%.$ The discount calculation occurs before addition of

the $5\%$ sales tax. Here are two sample output files$$one for a teacher and one

for a nonteacher.

Total purchases $$122\mathrm{.}00$

Teacher's discount $(12\%)14\mathrm{.}64$

Discounted total $107\mathrm{.}36$

Sales tax $(5\%)5\mathrm{.}37$

Total $$112\mathrm{.}73$

Total purchases $ $24\mathrm{.}90$

Sales tax $(5\%)1\mathrm{.}25$

Total $ $26\mathrm{.}15$

Note: to display a $\%$ sign, place two $\%$ signs in the format string:

printf$("\%$d$\%\%",$ SALES$\_$TAX$)$;