a group of 3 friends shared the cost of a tape recorder. if andy, barbara, and donna each paid $12, $30 and $18, respectively, then donna paid what percent of the cost of the tape recorder?

Answer 1

12 + 30 + 18 = 60

Donna pays $18 out of $60

= 18/60
simplify to 3/10
3/10 = 30%
Donna pays 30% of the total cost.