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Seats for Mathematics, Physics and Biology in a school are in the ratio of $5 : 7 : 8$. There is a proposal to increase these seats by $40\%, 50\%$ and $75\%$ respectively. What will be the ratio of increased seats?

1. $2:3:4$
2. $6:7:8$
3. $6:8:9$
4. None of the above options

Given that, ratio of seats $M:P:B = 5:7:8$

Let say $M = 50$, increased by $40\% = 50 + 50 \times \frac{40}{100} = 50 + 20 = 70$

$P = 70$, increased by $50\% = 70 + 70 \times \frac{50}{100} = 70 + 35 = 105$

$B = 80$, increased by $75\% = 80 + 80 \times \frac{75}{100} = 80 + 60 = 140$

$\therefore$ The required ratio $M:P;B = 70:105:140 = 2:3:4.$

So, the correct answer is $(A).$
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