please help

In a research company the ratio of technicians to researchers is 7:2.

a) If there are 200 researchers, calculate the total number of staff.

b) The technicians are paid £8.60 per hour and the researchers are paid £14.70 an hour. The company is making a promotional video showing how much money they invest in research. As part of this they want to know how much the total salary bill costs per minute. Calculate this value.

Answer and how to figure this out would be appreciated.​​