Amy was absent for 12 out of 180 days of school last year. What percent of the school year was she absent for?

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.

Me i’m stuck on all these questions besides the two bottom ones