K=28x(231+69)+72x(131+169)
K=28x300+72x300
K=(28+72)x300
K=100x300
K=30000
K = 28 . ( 231 + 69 ) + 72 . ( 131 + 169 )
K = 28 . 300 + 72 . 300
K = 300 . ( 28 + 72 )
K = 300 . 100
K = 30000
K = 28 ( 231 + 69 ) + 72 ( 131 + 169 )
K = 28 ( 231 + 69 ) + 72 ( 131 + 169 )
K = 28.300 + 72.300
K = ( 28 + 72 ).300
K = 100.300
K = 30000