Question

increase rupees 80 by 5%​

Answer 1

5% gain of 80 = 80 × 105/100

= 8400/100

= 84

84₹ is the answer.

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Answer 2

Hey BUddy ! ☺

$5\% \: of \: 80 = \frac{5}{100} \times 80 = 2.5 \\ \\ \therefore \: increased \: amt = 80 + 2.5 \\ = 82.5$