James paid Tsh 10000 to buy the following

items:
4.5 kg@600/=,2kg@1200/= and tomatoes 3kg by
1500/=.How much did he remain?#any one to
help me please *

Hard to understand your notation.

I will assume you mean:

4.5 kg at 600 per kg ----> 2700
2 kg at 1200 per kg -----> 2400
3 kg at 1500 per kg -----> 4500

total = 9600

leaving 10000-9600 = 400