The formula for the volume V of a cylinder is V = πr 2 h , where r is the radius of the base and h is the height of the cylinder.

Last year, laura had $30,000 to invest. she invested some of it in an account that paid 7% simple interest per year, and she invested the rest in an account that paid 8% simple interest per year. after one year, she received a total of $2230 in interest. how much did she invest in each account?