Step-by-step explanation:
Question 2
To convert a percentage into a decimal, divide by 100:
⇒ 4% = 4 ÷ 100 = 0.04
⇒ 25% = 25 ÷ 100 = 0.25
If a is 4% of b then: a = 0.04b
If b is 25% of c then: b = 0.25c
Substitute the second equation into the first:
⇒ a = 0.04b
⇒ a = 0.04(0.25c)
⇒ a = 0.01c
As 0.01 = 0.01 × 100 = 1%
Therefore, a is 1% of c.
⇒ a = 0.01c
⇒ a ÷ 0.01 = c
⇒ 100a = c
As 100 = 100 × 100 = 10,000%
Therefore, c is 10,000% of a.
