I need help on these questions

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

What sums are equal to 6/12? choose all answers that are correct a.6/12+6/12+6/12+6/12+6/12+6/12 b.2/12+1/12+1/12+2/12 c.5/12+1/12 d.1/12+1/12+1/12+3/12 plz : )

Wrote and expression for the difference of p and 4