Question

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Answer 1

1.

Complete step by step answer:

Let the income of B be Rs.x

.

Since, A’s income is 20% less than that of B’s, the income of A is calculated as follows:

A'sincome=(100−20)%ofB⇒A'sincome=80100×x⇒A'sincome=0.80x

Now, the percent increase in amount of B is calculated as follows:

Percent increase in amount of B = amount of B - amount of Aamount of A×100⇒Percent increase in amount of B = x−0.8x0.80x×100⇒Percent increase in amount of B = 0.2x0.80x×100⇒Percent increase in amount of B = 0.25×100⇒Percent increase in amount of B = 25

Thus, B’s income is 25% more than A’s income

2.

Start with assuming the original price per kg to be Rs. x .

reduction of 25% means price becomes = x - 25% of x

or new price =x−x4=3x4

Now, for Rs. 189 , the customer was able to buy, say, y kg of rice, then

189=( initial price per kg )×( weight bought )=x×y

And, now from the same amount of money, he can buy (y+3) kg of rice at new price

189=( new price per kg )×( new weight ) =3x4×(y+3)

So, now we need to find x from the following 2 equations :

189=x×y

189=3x4×(y+3)

If we substitute y from 1st equation in the 2nd, we get the following equation :

189=3×1894+9x4

or 189×14=9x4

or x=21

Hence, the original price was Rs 21

Answer 2

Answer:

1. 25

Step-by-step explanation:

Hope it's correct thank you

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