A reservoir's water level decreased by 20% over the summer due to evaporation. If the water level is currently at
120 million liters, how much water was there initially?

Suppose the local sales tax rate is 6.5% and you buy a car for \$12,500. What is the car's total cost?

Hint: Find how much tax is due first.

A city's population grew from 120,000 to 138,000 people in one year. What is the percent increase in population?

A smartphone originally costs \$800. It is on sale for \$680. Calculate the percent decrease in price.

Last season, a farmer harvested 500 kg of rice. Due to improved techniques, the harvest is estimated to increase by 20% this season. How much rice is the farmer looking to harvest this season?

A square garden has sides of 8 ft. The gardener reduces each side by 1 ft to make space for a pathway. What is the percent decrease in the perimeter of the garden? 

A pair of running shoes costs \$80. The store is offering a 25% discount. Calculate the amount of discount and the sale price of the shoes.

A smartphone originally costs \$800 but is now sold for \$680. Calculate the percent discount.

A patient was prescribed a medication dose. It was increased by 15% after days, and the new dosage is 23cc. What was the original dosage?