Help me asap !! please

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

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