Question gave you the savings for this month (20% more than last month). Take last month's savings to be 100% and this month's to be 120%. In other words, 120% = 648. To find original savings, divide 648 by 120 and multiply by 100. (It is like working with units. 648 is 120 units and you want to find the value of 100 units). Now, we move on to find the percentage of her salary that was saved. If 25% was spent on shopping and 45% on food, this leaves us with 30% for savings. Hence, we know that $540 (amount found earlier) makes up 30% of her original salary. As the amount spent on shopping this month is the same as last month, we can divide 540 by 30 and multiply it by 25 to find the amount spent on shopping. Next, we find the amount of her new salary. Since there was a 10% increase, the new salary can be interpreted as 110 units of the original salary. Hence, new salary can be found by dividing 540 by 30 and mulitplying by 110. Finally, to find the amount spent on food this month, jus subtract the amount saved this month and amount spent on food this month from the new salary. Hope this helps!!