Anew law requires that 12% of an individual's income be invested in the stock market. your accounts show that you need to put $420 in the stock market this year. how much did you earn this year.
a $5,040 b $350 c $504** d $3,500

If you need to put $420 this year and the law requires 12% of the income to be invested in the stock market, then you earned:
$240/0.12 = $3500 this year

So, you earned a total of $3,500 this with 12% of it invested in the stock market which is 12% of your total earnings leaving you with just $3,080