Acollege student earned $8200 during summer vacation working as a waiter in a restaurant on the boardwalk at the beach. the student invested part of the money at 7% and the rest at 10%. if the student received a total of $664 in interest at the end of the year, how much was invested at 10%?

Let f be the fraction invested at 10%. So (1-f) is the fraction at 7%. After one year the interest is

664 = 8200 f (.10) + 8200 (1-f) (.07) = 8200(.03)f + 8200(.07)

f = (664 - 8200(.07))/(8200(.03)) = .3659 = 36.59 %

36.59%

Check:

8200(.3659)*.1 + 8200(1-.3659)*.07 = 664.01 good

answer: sorry

step-by-step explanation: can you tell me pls how to find the rational of two integers

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632