A discount series of $10 \%, 20 \%$ and $40 \%$ is equal to a single discount of.......$\%$
A discount series of $10 \%, 20 \%$ and $40 \%$ is equal to a single discount of.......$\%$
- A
$56.80$
- B
$50$
- C
$70$
- D
$43.20$
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