How to get those answer?

29. lfthe target selling price is $120 and the target prot margin is a 40 per cent markup on cost. what is the target cost? A. $48 B. $72 C_.$85.70 D. $34.30 30. Cantrell has introduced a new product with a target price of $1 50 and a target cost of $90. What is the target percentage margin on sales? A. 20% B. 33.3% c_.40% D. 50% 31. Orwell is about to introduce a new product and has established a target cost of $144 and a target margin on sales of 40 her cent. What is the target price? A. $200 B. $ 58240 D. $280