Marissa currently saves 9% of her income. If she saves $300.00 a month, how much would she save if she put aside 18% of her income instead?
$690.00
$540.00
$600.00
$720.00
Let X be the amount of Marissa's monthly income. We want to find out what X should be so that Marissa can save $300 by saving 18% of her income.
18% of X = $300.
To find out how much X is, we must divide both sides of the equation by 18%. 18% is equal to 18/100 = <<18/100=0.18>>0.18.
0.18 * X = $300.
To find out the value of X, we should divide both sides by 0.18. So X = $300 / 0.18 = $1,666.67.
Therefore, Marissa would save 18% of $1,666.67 each month.
18% of $1,666.67 = (18/100) * $1,666.67 = $300.
Thus, if Marissa put aside 18% of her income, she would save $300.00. Answer: \boxed{300}.