ms1 = 240g, c% = 6%
ms2 = 360g, c% = 9%
stim ca c% = mdx100/ms
=> md1 = ms1xc1%/100
= 240x6/100 = 14,4 g
=> md2 = ms2xc2%/100
= 360x9/100 = 32,4 g
=> md.tot = md1+md2= 14,4+32,4 = 46,8 g
ms.tot = ms1+ms2 = 240+360 = 600 g
=> c%.finala = md.totx100/ms.tot
= 46,8x100/600 = 7,8%