The first thing to do is to set Lisa'a income as the total amount of money. Then begin subtracting amounts of money from any category from her total income (1350) except for her Savings and Giving. 1350 - 240 - 560 - 110 - 150 = 290. Now subtract Lisa's current savings from 290. 290 - 100 = 190. This amount is how much more money Lisa can put away for savings.