Question #3bad8

1 Answer

10 years

Explanation:

for company A:

24000, 27200, 30400......

Arithmetic progression with #d=3200#

#a_n=24000+(n-1)*3200#
#a_n=20800+3200n#

For company B:

32000, 34400, 36800......

Arithmetic progression with #d=2400#

#a_n=32000+(n-1)*2400#
#a_n=29600+2400n#

Equate the two #a_n#s

#a_n=a_n#

#20800+3200n=29600+2400n#

#3200n-2400n=29600-20800#

#800n=8800#
#n=8800/800=11#

#n=11#

the salary will be equal on the 11th term which is 10 years from the starting salary

God bless..... I hope the explanation is useful.