Question 453150
The interest on an investment varies directly as the rate of interest.
 If the interest is $60 when the interest rate is 4.5%, find the interest when the rate is 4.2%.
:
We can use proportion here, let x = amt when int rate is 4.2
:
{{{4.5/4.2}}} = {{{60/x}}}
Cross multiply
4.5x = 4.2* 60
4.5x = 252
x = {{{252/4.5}}}
x = $56