After a 15% increase: \( 100 \times 1.15 = 115 \).
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- Water needed to fill: \( 500 - 100 = 400 \) liters.
- Time to fill: \( \frac{400}{25} = 16 \) minutes.
- A company’s stock price increased by 15% in the first quarter and then decreased by 10% in the second quarter. If the initial stock price was $100, what is the price after the two quarters?
- After a 10% decrease: \( 115 \times 0.90 = 103.5 \).
- #### 103.5
- A train travels 180 km at a speed of 60 km/h and then another 240 km at 80 km/h. What is the average speed for the entire journey?
