So,
First, we find the prime factored form (P.F.F.) of 65 and 91.
P.F.F. of 65: 5 * 13
P.F.F. of 91: 7 * 13
Find the common numbers
13
13 = G.C.F.
Note: This method works for finding any G.C.F. (find common primes)
Take half of the coefficient on the x term
The original value was <span>£720.
720 x .15 (15%) = 108
720 + 108 = 828 </span>
Answer:
I guess B....................