Can someone please help with this question?

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost. swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Does anyone know how to do geometryme with this problem

If g^-1(x) is the inverse of g (x) which statement must be true