What’s the answer, help me find the solution quick

The price of a coat increased from $78 to $92. what is the price increase percentage?

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

This is so hard and it’s for a test