Survival Rates and Percent Changes

The video tutorial covers various mathematical concepts related to percentages, including percent increase and decrease, inflation's impact on dollar value, survival rates of salmon through turbines, price calculations involving discounts and markups, and population growth. It also explains the percent change formula and its application in different scenarios.

If the value of a dollar decreases by 3.2% annually, what would be its value after one year if it started at $1?

• $0.95

• $0.968

• $0.99

• $0.97

How do you calculate the value of a dollar after multiple years of depreciation?

• Add the depreciation rate to the initial value for each year

• Multiply the initial value by the depreciation rate for each year

• Divide the initial value by the depreciation rate for each year

• Subtract the depreciation rate from the initial value for each year

What is the survival rate of salmon after passing through one turbine if 12% are killed?

• 78%

• 88%

• 85%

• 90%

If 1000 salmon start their journey, how many are expected to survive after passing through 8 turbines?

• 500

• 400

• 360

• 600

A pair of shoes is on sale for $33, which is 40% of the original price. What was the original price?

• $70

• $80

• $60

• $55

If a store marks up a product by 40%, what is the new price if the original price was $75?

• $115

• $110

• $100

• $105

How do you calculate the percent change between two values?

• Subtract the smaller value from the larger value, divide by the original value, and multiply by 100

• Add the two values, divide by the original value, and multiply by 100

• Multiply the two values, divide by the original value, and multiply by 100

• Subtract the larger value from the smaller value, divide by the new value, and multiply by 100

If a population increases from 34 to 56, what is the percent increase?

• 50%

• 60%

• 64.7%

• 70%

What is the percent decrease if a value drops from 72 to 18?

• 70%

• 80%

• 75%

• 65%

If a store buys an aquarium for $75 and marks it up by 50%, what is the selling price?

• $110

• $100

• $112.50

• $125