Answer: 143.46
Explanation:
If she made $100 a week that would be 400 for the 4 weeks
400 minus all she spent
400-50.2-65.1-115.3-10
=159.4
then 1/10 goes to donation to find a fractional portion multiply fraction by #
=1/10 * 159.40 =15.94 is what she donated
159.4-15.94= 143.46 is what is left