please help me this solution please

North Sydney Ltd sells hand painted lamps at an average price per unit of $70. Variable manufacturing costs are estimated to be $30 per unit. Fixed costs are expected to amount to $160,000 per year.

Required:

1.Calculate the contribution margin per hand painted lamp. (1 mark)

2.Calculate the contribution margin ratio per hand painted lamp. (1 mark)

3.Calculate the break-even pointin sales dollars. (2 marks)

4. If the company's fixed costs reduce what will happen to the break-even point calculated above in (3)? (No calculations are required) (1 mark)