Erin has £300 in his savings account His bank offers him a fixed 5% simple interest rate per annum for a period for 3 years
How many interest will be have earned after 3 years ?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.