The marked price of an article is ? 500. It is sold on two successive discounts of 20% and 10%. The selling price of that article is

In a game of 1000 meters, If A scores 1000 meters then B scores 950 meters and C scores 920 meters.
? B runs 1000 m while C scores 920 x 1000 / 950= 18400 / 19 m
Hence, in 1000 m race, B can give C (1000 - 18400 / 19) = 600 / 19 = 31¹¹?₁₉ meters start.

? log_a3 = 1/3
? 3 = (a)^1/3
? a = 27

Let the number be N,
Then, 137.5% of N = 33
? N = (33 x 100)/137.5 = 24

SP = 100/12 paise
Let's CP = x
SP = 0.8x = 100/12
? x = 10/(0.8x12) paise
Therefore, CP = 100/9.6 paise

Thus the new SP (with 20% profit) = 100/9.6 X 1.2 = 100/8 paise
Hence, 8 apples can be purchased for Rs.1 to gain 20%

CP = (100/30) x 400 = ? 4000/3
[? CP = {100/(100 - Loss%)} x SP]

Cost of the horse paid by A = (4860 x 100) / 81 = Rs. 6000
Cost of the horse paid by C = (6000 x 117) / 100 = Rs. 7020
Gain of B = Rs. 7020 - Rs. 4860 = Rs. 2160