Answer:
The question has a mistake
Step-by-step explanation:
11d+7c= 172.5
10d+7c= 155.8
By subtraction;
1d+ 0c = 16.7
1d = 16.7
11×16.7+7c=172.5
7c = 172.5-11*16.7
You will get a negative answer yet the cost cannot be negative.
This is ur ans
a.y=5x or x=y/5
b.y=60
y/x=5
y/12=5
y=60
12000
1200=100
x=1000
x=100*1200/100
c
