Answer:
12.25%.
explanation :
I add 8.25% and 4 since you are trying to find the interest of his account earn after 4 years. 8.25 + 4= 12.25. Yea so that is how I get my answer.
(xy=x times y just fyi)
bought bike for 368.9
this was including sales tax of 8.5%
(percent means part out of 100 so 8.5%=8.5/100=0.85/10= 0.085/1 1=0.085)
so paid=price+tax
paid=368.9
price=p
tax=p times 8.5%=0.085
368.9=p+p times 0.085
368.9=p+0.085p
or
p+0.085p=368.9
the answer is C
From 1846 to 1847 it’s -40% and from 1847 to 1848 it’s 123.3%
C= x2-x1/ x-1
When you multiply you add the exponents, so 7^9*7^-3=7^6