Given data:
The given amount of money Maria have p=$600.
The interest earn by Maria is i=$30.
The given amount of money Janae have p'=$350.
The given time is t=12 months=1 year.
The expression for the interest is,
i=(pxrxt)/100
30=(600)(r)(1)/100
30 =6r
r=5
The expression for interest earn by Janae is,
i'=(p'xrxt)/100
Substitute the given values in the above expression.
i'=(350)(5)(1)/100
=$17.5
Thus, Janae earn $17.5 money from her investment.