Respuesta :

To get the result we can use proportion
10% -----------80
100% ---------x
Crossmultiply now
10*x=100*80
10x=8000     /:10
x=800 - its the answer

33.333% -----------21
100% --------------x
crossmultiply
33.33x=21*100
33.33x=2100         /:33.33
x=63 - its the answeer

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