2. A cellphone with original price of ₱3,000 is now sold at ₱1,800. Solve for percent of change and specify if increase or decrease.
3. Jean works in a supermarket for ₱50 per hour. If her pay is increased to ₱55, how much is the percent of increase in her pay?
4. A pair of pants that cost ₱600 last month is now at ₱550 during the sale. What is the percent of decrease?
5. Joy weighed 80 kilograms last month. She is on diet these days and now she is 76 kilograms. What is the percent of change in Joy's weight?
Answer (2)
The calculations reveal a 40% decrease for the cellphone price, a 10% increase in Jean's pay, an 8.33% decrease on the pants, and a 5% decrease in Joy's weight. Each percent change was determined using the formula for percent change. This allows for a clearer understanding of how values have changed comparatively.
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To solve each of these problems, we need to calculate the percent of change. The percent of change can be calculated using the formula:
Percent Change = ( Original Value New Value − Original Value ) × 100%
Let's look at each scenario step-by-step.
Cellphone Price Change:
Original Price: ₱3,000
New Price: ₱1,800
Change: ₱1,800 - ₱3,000 = -₱1,200 (decrease)
Percent Decrease: ( 3000 − 1200 ) × 100 = − 40%
This is a 40% decrease in price.
Jean's Pay Increase:
Original Pay per Hour: ₱50
New Pay per Hour: ₱55
Increase: ₱55 - ₱50 = ₱5
Percent Increase: ( 50 5 ) × 100 = 10%
This is a 10% increase in pay.
Pants Price Decrease:
Original Price: ₱600
New Price: ₱550
Decrease: ₱550 - ₱600 = -₱50
Percent Decrease: ( 600 − 50 ) × 100 = − 8.33%
This is approximately an 8.33% decrease in price.
Joy's Weight Change:
Original Weight: 80 kg
New Weight: 76 kg
Decrease: 76 kg - 80 kg = -4 kg
Percent Decrease: ( 80 − 4 ) × 100 = − 5%
This is a 5% decrease in Joy's weight.
Each calculation above correctly shows the percent change and whether it's an increase or decrease, based on the initial and new values provided.
