HELP WILL AWARD BRAINLIEST Can Someone Help Me With 1. Through 3.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?