Consumption and Saving $-$ End of Chapter Problem

Your friend just got an unexpected $$1,000$ tax refund. She plans to put $$800$ towards paying off credit card debt, $$100$ toward her student loans, and use the remaining $$100$ to purchase a new grill for her deck. What's your friend's marginal propensity to consume $($MPC$)?$

MPC:

By how much did she increase her net wealth?

Change in net wealth: $