Math ASGS problem, please help

19. There are 500 employees in Company X. At the end of every year, 20 employees will quit or retire from the company. Moreover, at the beginning of the second year, the company will recruit 5% more new employees every year. Express your answer to the nearest unit in this question. (a) (i) Find the number of employees at the end of the third year. (ii) Express the number of employees at the end of the nith year in terms of n. (4 marks) (b) At the beginning of the 10th year, Company X takes a staff photo as shown in Figure 4. Except for the last row, the number of staff in the (m+1)th row is 2 fewer than the moh row, where m = 1, 2, 3, ... O . . . . . . 1 st row O . . . . . . 2nd row . . . . . . Figure 4 (i) At least how many staff are there in the 1 st row? (ii) If the 1st row has the least number of staff, how many staff are there in the last row? (7 marks)