Answer:
C. 
Step-by-step explanation:
Let be 
the excedent on annual sales and 
the bonus factor, to determine the bonus amount a composition of 
is 
must be done. That is:
Hence, the right answer is C.
The best thing to do is to find the cost of one sweet, and to do this, divide 42 by 7.
42/7= 6
Therefore, one sweet costs 6p.
To find the cost of 8 sweets, you've got to multiply 6 by 8, and this gives you 54p.
Therefore, 8 sweets cost 54p
Hope this helps :)
You subtract 6 from both sides, and then multiply by 6 on both sides. You should get -20.
