Answer :
Answer:
Step-by-step explanation:To solve this problem, let's define the variables and set up the equations based on the given information.
Let:
- \( x \) be the cost price of a packet of sketch colours,
- \( y \) be the cost price of a packet of pencil colours.
According to the problem:
1. The shopkeeper earns a profit of ₹9 by selling a packet of sketch colours. Therefore, the selling price (SP) of a packet of sketch colours is \( x + 9 \).
2. The shopkeeper incurs a loss of ₹4 per packet of pencil colours. Therefore, the selling price (SP) of a packet of pencil colours is \( y - 4 \).
For sketch colours:
\[ \text{Profit} = \text{Selling Price} - \text{Cost Price} \]
\[ 9 = (x + 9) - x \]
\[ 9 = 9 \]
This equation is true, but it doesn't provide any new information about \( x \).
For pencil colours:
\[ \text{Loss} = \text{Cost Price} - \text{Selling Price} \]
\[ 4 = y - (y - 4) \]