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 *

I can't say I much care for your notation or your grammar, but

4.5*600 + 2*1200 + 3*1500 = 9600

That's how much he spent.
So, ...