CPT maths doubt

There are 10 skilled workers...

therefore number of Semi Skilled workers would be 50 and unskilled workers would be 20 (1:5:2)

Total wage of 10 skilled workers = 60000 (Given)....

therefore wage of 1 skilled worker (10 : 6 : 2) = 6000....

therefore wage of 1 semi skilled worker (10: 6 : 2)   = 3600 (10:6:2)

similarly wage of 1 unskilled worker (10: 6 : 2) = 1200 (10:6:2)

therefore total wage = (10skilled worker* 6000per worker) + (50semi skilled worker*3600per worker) + (20unskilled worker*1200) 

= 60000+180000+24000

=264000