Step 1
<u>Find the profit in two months</u>
Multiply the total amount made by the whole group in two months (
) by the total number of persons (
)

Step 2
<u>Find the profit of the shop in the second month</u>
we know that

so

substitute the values

therefore
<u>the answer is</u>

Answer:
1 a=-5 b=52 c=-52
it is the required answer