how to find finding 150% of a whole number

At the market, Joey buys 3 avocados for $.40 each and 5 lemons for $0.40 each. The cashier in training rings up 3 * 0.40 and then 5 * 0.40 to get the total. The experienced cashier says to add the 3 plus 5 in his head and then ring up 8 * 0.40.

A student has scores of 70 and 80 on two tests. What must the student score on the last test to ensure that her average is greater than 80?

A jacket selling for $100 is on sale for 5% off

Here is another question 2/5 divided by 1/6

A cuboid is 4cm long, 7cm wide and 10cm high ... A similar cuboid is 25cm high, calculate its length and width ...

Henry's calculator is 2 1⁄4 inches wide and 5 1⁄4 inches long. What is the area of the calculator?

How long will it take an object dropped from a window to fall a distance of 78.4 meters?

Alison, the owner of a regional chain of pizza stores, is trying to decide whether to add calzones to the menu. She conducts a survey of 700 people in the region and asks whether they would order calzones if they were on the menu.

What is the completely factored form of x2y - 2xy - 24y?

What is 38.86 rounded to one decimal place, i might have forgot xP