A salesman gained P99 for selling ice cream on the first day, gained P90 on the second day, and lost P50 on the third day. How much was his total gain?

1. ### Break Down the Problem

We need to calculate the total gain of the salesman over three days. This involves adding his gains from the first two days and subtracting his loss from the third day.

2. ### Relevant Concepts

To find the total gain, we will use the following formula: $\text{Total Gain} = (\text{Gain on Day 1} + \text{Gain on Day 2} - \text{Loss on Day 3})$

3. ### Analysis and Detail

• Gain on Day 1 = P99
• Gain on Day 2 = P90
• Loss on Day 3 = P50

Now substituting the values into the formula: $\text{Total Gain} = (99 + 90 - 50)$

4. ### Verify and Summarize

Calculating the values step-by-step:

1. Add the gains: $99 + 90 = 189$
2. Subtract the loss: $189 - 50 = 139$

Final Answer

The total gain of the salesman is P139.