A year ago their salaries was 3:4
let their salaries be 3p and 4p respectively
Ratio b/w the individual salary of last year and this year;
for A = 4/5
current salary be x;
so 3p/x=4/5
x=15p/4
for B = 2:3
4p/y=2/3
y=6p
Now;
x+y=8580
putting the value of x and y we get
p=880
x=15p/4
then, x=3300
Ans(b)3300