Karen Morrison and Nick Hamshaw Solutions for Exercise 4: Exercise 17.4

If you invest a sum of money at a simple interest rate of $6\%$, how long will it take for your original amount to treble?

Jessica spends $\frac{1}{4}$ of her income from odd jobs on books, $\frac{1}{3}$ on transport and $\frac{1}{6}$ on clothing. The rest she saves. If she saves $\$8$ per month, how much is her income each month? Give your answer in $\$$

Jessica spends $\frac{1}{4}$ of her income from odd jobs on books, $\frac{1}{3}$ on transport and $\frac{1}{6}$ on clothing. How much does she save in a year at a rate of $\$8$ per month? [Give your answer in $\$$]

Jessica spends $\frac{1}{4}$ of her income from odd jobs on books, $\frac{1}{3}$ on transport and $\frac{1}{6}$ on clothing. She saves $\$8$ per month. If she deposits one year's savings into an account that pays $8.5\%$ interest for five years, then how much interest would she earn?

Jessica spends $\frac{1}{4}$ of her income from odd jobs on books, $\frac{1}{3}$ on transport and $\frac{1}{6}$ on clothing. She saves $\$8$ per month. If she deposits one year's savings into an account that pays $8.5\%$ interest for five years, then how much would she have altogether in the end?

Mrs MacGregor took a personal loan of $\$8000$ over three years. She repaid $\$325$ per month in that period. How much did she repay in total?

Mrs MacGregor took a personal loan of $\$8000$ over three years. She repaid $\$325$ per month in that period. How much interest did she pay in pounds?

Mrs MacGregor took a personal loan of $\$8000$ over three years. She repaid $\$325$ per month in that period. At what rate was simple interest charged over the three years?