Answer:
c. 69
b. 7
Step-by-step explanation:
Regular price = 300
Sale = 15%
Price after sale
= 300 - 15%(300)
= 300 - 15/100 x 300
= 300 - 15 x 3
= 300 - 45
= 255
in this set will be real numbers that are both less than 
and greater than 
. But that's not possible, so this set is empty.