Question

12. Decrease : (1) 400 by 25% (ii) 8 by 12%​

Answer 1

1)

$= 400 \times (1 - \frac{25}{100} ) \\ = 400 \times \frac{100 - 25}{100} \\ = 4 \times 75 \\ = 300$

2)

$8 \times (1 - \frac{12}{100} ) \\ = 8 \times \frac{100 - 12}{10 0} \\ = 8 \times \frac{88}{100} = \frac{704}{100} = 7.04$

Answer 2

Answer:

1) 400 by 25% = 400/100×25 = 100

2) 8 by 12% = 8/100×12 = 0.96