Answer:Let's solve each part of the math problem from your screenshot:### Part (a):To find the percentage increase of the sales at a Jollibee branch:1. **Original sales**: ₱100,0002. **New sales**: ₱150,0003. **Increase**: ₱150,000 - ₱100,000 = ₱50,000**Percentage increase** formula: \[ \text{Percentage Increase} = \left(\frac{\text{Increase}}{\text{Original Amount}}\right) \times 100 \]\[ \text{Percentage Increase} = \left(\frac{₱50,000}{₱100,000}\right) \times 100 = 50\% \]### Part (b):To find the percentage increase in the price of a liter of petroleum:1. **Original price**: ₱67.002. **New price**: ₱68.343. **Increase**: ₱68.34 - ₱67.00 = ₱1.34**Percentage increase**:\[ \text{Percentage Increase} = \left(\frac{₱1.34}{₱67.00}\right) \times 100 = 2\% \]### Part (c):To find the percentage change in Mr. Shy's monthly salary:1. **Original salary**: ₱8,8002. **New salary**: ₱9,2843. **Increase**: ₱9,284 - ₱8,800 = ₱484**Percentage increase**:\[ \text{Percentage Increase} = \left(\frac{₱484}{₱8,800}\right) \times 100 \approx 5.5\% \]These calculations show how each value has changed as a percentage of its original value.