a college student earned 8200 during summer vacation working as a waiter in a popular resturant. the student invested part of the money at 10% and the rest at 7 %. if the student recieved a total of 664 in interest at the end of the year how much was invested at 10 %
a.3000
b.1171
c.5200
d.4100

Question

a college student earned 8200 during summer vacation working as a waiter in a popular resturant. the student invested part of the money at 10% and the rest at 7 %. if the student recieved a total of 664 in interest at the end of the year how much was invested at 10 %
a.3000
b.1171
c.5200
d.4100

amistre64 · Answer

hmmm, what type of interest?  looks like we should prolly assume simple interest

amistre64 · Answer

ideally you have to sets of cash; lets call them a and b

a + b = 8200 ; thats how much you got during the summer

you divvy it up such that

a(12*10%) + b(12*7%) = 664  for the different interest rates

amistre64 · Answer

this gives us 2 equation in 2 unknowns to play with

anonymous · Answer

oky internet went out and just came back on