Question

Comprei 800 gramas de banana. 1 quilo custa R$ 2,78. Quanto vou pagar?

Answer 1

1000g ----------- R$ 2,78
800g ------------ R$ X

X = (800 * 2,78) /1000
X= 2,22 reais

Answer 2

1kg------2,78r$
0,8kg---xr$

x=2,78.0,8= 2,22 r$