Answer:
Contribution margin ratio = 1 - variable cost ratio
= 25%
(a)
![Break\ even\ in\ dollars=(fixed\ costs)/(contribution\ margin)](https://img.qammunity.org/2020/formulas/business/college/ml57jb1pzkc3b4aod1ykukk7blopl1mg01.png)
![Break\ even\ in\ dollars=(350,000)/(0.25)](https://img.qammunity.org/2020/formulas/business/college/fa9ha34f9vl9lc9ieaxhnnafh62f6ifgq2.png)
= 1,400,000
![Break\ even\ in\ units=(Break\ even\ in\ dollars)/(sales\ price)](https://img.qammunity.org/2020/formulas/business/college/nr7lzs6pobza5jyso3vaeatk0i33oshkob.png)
![Break\ even\ in\ units=(1,400,000)/(56)](https://img.qammunity.org/2020/formulas/business/college/rvsy6pe74rhc7jp0afcpj8kotsu4q57cnc.png)
= 25,000
(b) For profit of $42,000,
![sales=(Profit+fixed\ cost)/(contribution\ margin\ ratio)](https://img.qammunity.org/2020/formulas/business/college/a4el1ajf2g87n5d0n1nwrwlu4w0917ph89.png)
![sales=(42,000+350,000)/(0.25)](https://img.qammunity.org/2020/formulas/business/college/7wenqeustl6pzzibba7pktszdl589pu63t.png)
= 1,568,000
![In\ units=(sales)/(sales\ price)](https://img.qammunity.org/2020/formulas/business/college/uu1a5jgtv8do1nsmo9rrkg45ewxceik9a3.png)
![In\ units=(1,568,000)/(56)](https://img.qammunity.org/2020/formulas/business/college/n4f094hv7hwtixn958ds5xrrvpsrfr22qb.png)
= 28,000
(c) variable cost = sales price × variable cost ratio
= $56 × 75%
= $42
New contribution margin =
![(New\ sales\ price-variable\ cost)/(New\ sales\ price)](https://img.qammunity.org/2020/formulas/business/college/jttwn1geqf3wxxg5drob8gk3o0loz50wje.png)
New contribution margin =
![(70-42)/(70)](https://img.qammunity.org/2020/formulas/business/college/lw53kguy5xy0hvzhptoovnj331l779rikz.png)
= 0.4
= 40%
![New\ Break\ even\ in\ dollars=(fixed\ costs)/(contribution\ margin)](https://img.qammunity.org/2020/formulas/business/college/ljejapj5mlrdzes6562ml8zgqq06s3d8tx.png)
![New\ Break\ even\ in\ dollars=(350,000)/(0.4)](https://img.qammunity.org/2020/formulas/business/college/4kytbbd2txa069ltq4teofuu7xh7aukyad.png)
= $875,000
![New\ Break\ even\ in\ units=(New\ Break\ even\ in\ dollars)/(New\ sales\ price)](https://img.qammunity.org/2020/formulas/business/college/f8l2652b76m83iy6xbl3w5idze8dkayt5n.png)
![New\ Break\ even\ in\ units=(875,000)/(70)](https://img.qammunity.org/2020/formulas/business/college/kge2nq6jodkc7sheb6dsrmnjqhlrhl6sri.png)
= 12,500