Miguel spends $35 a day for 4 days. He earns $21 a day for 5 days. Does Miguel end up with more or less money than he started with? By how much?

a. Miguel ends up with $35 more than he started with.
b. Miguel ends up with $35 less than he started with.
c. Miguel ends up with $91 more than he started with.
d. Miguel ends up with $91 less than he started with.