Using Scheme Code DrRacket

Some credit-card companies pay back a small portion of thecharges a customer makes over a year. One company returns

(a) 0.25% for the rst $500 of charges, (b) 0.50% for the next $1000 (that is, the portion between $500 and$1500), (c) 0.75% for the next $1000 (that is, the portion between $1500 and$2500), (d) and 1.0% for everything above $2500.

Thus, a customer who charges $400 a year receives $1.00, which is0.25% * 400, and one who charges $1,400 a year receives $5.75, whichis 1.25 = 0.25% * 500 for the rst $500 and 0.50% * 900 = 4.50 forthe next $900. Dene the function payback, which consumes a charge amount andcomputes the corresponding pay-back amount.