20. A computer chip manufacturer had net sales of $390 million with returns equal to 1/50 of gross sales. Find gross sales rounded to the nearest million given that net sales equals gross sales less returns.

21. The manager of one theatre marks up the cost of chocolate covered raisins by 18

of the cost of raisins. Find the cost to the nearest cent if the theatre sells a box of raisins for $3.70.

(Hint: Selling price is cost plus markup.).

22. Last year, the expenses at Mack's Pizzeria were 9/10 of the total revenue and the remainder was profit. The profit, or the total revenue less expenses, was $124,800. Find the total revenue.

23. For the following problem, use the formula I=PRT, where I is interest in dollars, P is the principal or loan amount, R is the interest rate, and T is the time in years.Find the interest if principal of$4100 is invested at (BIG #) 5 1/2% (or 0.055) for threeyears.

24. What is the simple interest rate if $51.09 in interest is earned on a deposit of $1828.57 in one year? (I=PRT)

25. A man needed money for college. He borrowed a principal (P) of $7,000 invested over an unknown amount of time (T) at 12% (R= 0.12) yields $630 in interest (I). Use I=PRT to find the time.

26. Diana had $2176 in her account after 7 years. If the account paid 4% (or 0.04) interest, how much did Diana initially deposit in the account? [M=P(1+RT)]