Question

a reducing of 20% in the price of rice enables a person to buy 3.5 kg more rice for Rs 77 find the original price of rice per kg

Answer 1

let a kg be initial price of rice

so you get to buy 77/a kgs of rice.

price reduced to 20% so effective price 80% of a

a x 80/100 = ax4/5 = 4a/5  is effective price

then you get to buy 77/(4a/5) = (77x5)/4a = 385/4a kgs of rice

already said by decreasing price by 20% can get 3.5 kgs more rice

so (385/4a) - (77/a) =3.5

by solving (see in below picture)

a=5.5

so original price is Rs. 5.5.

Step-by-step explanation:

Answer 2

Answer:

Ans 55kg

Step-by-step explanation:

Here, R = 20%, A = 3.5 kg and P = ₹ 770

According to the formula ,

Actual price of rice = [PR /(100 - R)] A

= [(20 x 770) / (100 - 20)] x 3.5

= [(20 x 770) / (80 x 3.5)

= Rs 55