The price of a calculator dropped from $23.88 to $19.68. What was the percent change in price? Rounded to nearest tenth percent.

the quadratic function h(t)=-16.1t^2+150 models a ball's height, in feet, over time, in seconds, after it is dropped from a 15 story building.
- From what height, in feet, was the ball dropped?
-After how many seconds, rounded to the nearest hundredth, did the ball hit the ground?

Use a calculator to approximate the square root. Round to the nearest tenth.

1. A supermarket has a policy of marking up the cost prices of their goods by  percent. Calculate the cost price of a toothbrush that was sold for . Round your answer to the nearest cent.

2. A game console has a sale price of  after a discount of  percent was applied. What was the original marked price of the console?