Question

Please help me, I need it

Answer 1

you had it all here...
http://openstudy.com/users/pphalke#/updates/5769982ae4b04305c04fd4a4

You just do something wrong with you calculate it

Answer 2

You need to follow order of operations correctly, like so:\[\frac{12\times200+10\times 300+8\times 540}{30}=\]
\[\frac{2400+ 3000+4320}{30}=\]
Add up everything on the top first... 2400+3000+4320 = 9720
\[\frac{9720}{30}=\]

Answer 3

324