I'm sorry to bother you, I don't know how to solve it

Bohai is a sole trader. He started his interior design business in 2021 with a capital investment from his own savings of $175000. Although Bohai's business is profitable (See Table 1 below), he has not been able to finance expansion plans. Bohai wants to offer his interior design services to public sector businesses such as care homes for the elderly. His brother, Feng, has just sold his share of a fashion design business and has suggested to his brother that they go into business together. "With the two of us working together we will be able to take on more work and expand into other segments of the market. Feng's proposal has given Bohai much to think about! Table 1 Financial data 2021 2021 Revenue 65000 Costs* 11500 Includes fixed costs of E2000 (a) Explain two methods of market segmentation. (b) Using the information in Table 1 and other information, calculate Bohai's % gross profit margin for 2021 (c) Using the information in Table 2 and other information, calculate Bohai's return on capital employed for 2021 (d) Do you think Bohai should accept his brothers offer to go into partnership together? Justify your