10% means for every 100 she spend 10
in 800 there are 8 100 thus she speds 80
or 10% to decimal form is

3/5 of 300 is 180. 180 coupons were unused.
Answer:
8.43 years
Step-by-step explanation:
Given data
Cost price P= $4995
Rate r= 10%
FInal amount A= $2150
The expression for the time/duration is given as
t= ln(A/p)/r
t= ln(2150/4995)/0.1
t= ln(0.430)/0.1
t= 0.843/0.1
t= 8.43
Hence the time it will take is 8.43 years
Answer:
15 units
Step-by-step explanation:
hope i helped!