Question 1145331
r=n+.12
n=r-.12
9*r+12*n=5.28
9*r+12*(r-.12)=5.28
9r+12r-1.44=5.28
21r=6.72
r=6.72/21
r=.32=32p for a raisin bar
n=.20=20p for a nut bar
9r=9*.32=£2.88
9n=9*.20=£1.80
9*.32-9*.20=£1.08 more for 9 raisin bars