A) the markdown is $9.99
b) original sale price is $39.99
c) after using the coupon the price would be $29.99
in order to find this out you would first divide the original price of 39.99 by 100 in order to find out what 1% is. Then you would multiply this number by 25 to find out what 25% is. Then you would subtract the original amount of 39.99 by the 25% amount in order to find out how much is taken off
Answer: 
Work Shown:
I'm assuming your teacher wants you to factor as much as possible.
In the last step, I used the rule that 
We cannot factor any further. If the first term was 
instead of 
, then we could use the difference of squares factoring rule.
Subtract final value minus starting value.
Divide that amount by the absolute value of the starting value.
Multiply by 100 to get percent increase.
If the percentage is negative, it means there was a decrease and not an increas
M=4b
m=27+b
subsitute
4b=27+b
minus b
3b=27
divide 3
b=9
sub back
4b=m
4(9)=m
36=m
michel=36 and brandon is 9
360x=10.8
3600x=108
x=1.08/3600
x=.03
3%
The sales tax rate is 3%
