a techno startup company employs 220 people in total. The company has 5% of staff in HR, a sales and marketing staff which is 30% of the head count and the remainder in R&D. The R&D consists of chemists and biologists. The number of biologists are 21 more than the number of chemists.

What is the number of biologists in the company?

Due to a new round of venture capital funding the company increases the total head count by 50%. The R&D now represents 80% of the head count and there was no change in the HR staff. What percentage of the company is the sales and marketing?

One year later the company decides to have a head count reduction of 30%. R&D and sales and marketing department were affected by the reuction. R&D lost 61 people more than sales and marketing. After the reduction what percentage of employees are in the R&D?