Consider the following financial producuts that both generate interest via simple

interest rates per annum:

$x$: Principle $=$$$320,$ Rate $=12\mathrm{.}4\%$

Y: Principle $=$$$870,$ Rate $=???$

What interest rate should $Y$ have to have an equal growth rate to that of

financial product $x?$ Give answer as a decimal $($i$.$e$.12\mathrm{.}34\%$ should be given as

$0\mathrm{.}1234$