Question

A's salary is 20% less than B and B's salary is 20% less than C. How much percent is A's salary less than C?

Answer 1

20% is the answer.........

Answer 2

Answer:  A's salary is 36% less than C's salary.

Step-by-step explanation:  Given that A's salary is 20% less than B and B's salary is 20% less than C.

We are to find by how much percent A's salary is less than C's salary.

Let x, y and z represents A's salary, B's salary and C's salary respectively.

According to the given information, we have

$x=y-20\%\times y=y-\dfrac{20}{100}y=y-\dfrac{y}{5}=\dfrac{4y}{5},\\\\\\y=z-20\%\times z=\dfrac{4z}{5}.$

So, we get

$x\\\\\\=\dfrac{4y}{5}\\\\\\=\dfrac{4}{5}\times\dfrac{4z}{5}\\\\\\=\dfrac{16}{25}z\\\\\\=\dfrac{25-9}{25}z\\\\\\=z-\dfrac{9}{25}z\\\\\\=z-\dfrac{9}{25}\times100\%\times z\\\\\\=z-36\%\times z.$

Thus, A's salary is 36% less than C's salary.