1. How much will the interest be on a loan of $2,350 at a simple interest of 7% for 6 months?
2. If a loan of $5,750 is taken out at a simple interest of 5.25% for a year and a half, how much interest will the borrower pay?
3. At what rate of simple interest would a loan of $3,000 be taken for 2 years if the total interest is $375?
4. At what rate of interest would Janet take out a loan of $13,000 for 3.5 years if she pays $4,322 in interest?