11per14 x 1.78 pake cara ya

[tex] \frac{11}{14} \times 1.78 \\ = \frac{11}{4} \times 1 \frac{78}{100} \\ = \frac{11}{14} \times \frac{178}{100} \\ = \frac{11}{14} \times \frac{89}{50} \\ = \frac{979}{700} = 1 \frac{279}{700} [/tex]