Oranges are bought at 6 for Rs 10 and sold at 4 for Rs 9. Find the gain% or loss%.

(9/4) / (10/6) = 27/20

so, what % gain is that?

35%

To find the gain% or loss% in this scenario, we need to compare the cost price (CP) and the selling price (SP) of the oranges.

Given:
Oranges are bought at 6 for Rs 10.
Oranges are sold at 4 for Rs 9.

Let's calculate the cost price and the selling price of a single orange.

Cost price (CP) of one orange = 10/6 = Rs 5/3
Selling price (SP) of one orange = 9/4

Now, we can compare the CP and SP to determine if there is a gain or loss.

If CP > SP, there is a loss.
If CP < SP, there is a gain.
If CP = SP, there is no gain or loss.

Let's calculate the gain or loss percentage:

If CP > SP:
Loss = CP - SP
Loss% = (Loss/CP) * 100%

If CP < SP:
Gain = SP - CP
Gain% = (Gain/CP) * 100%

If CP = SP:
No gain or loss

Let's calculate:

CP = Rs 5/3, SP = Rs 9/4

CP < SP, so there is a gain.

Gain = SP - CP
Gain = (9/4) - (5/3)
Gain = (27 - 20) / 12
Gain = 7 / 12

Now, let's calculate the gain percentage:

Gain% = (Gain/CP) * 100%
Gain% = (7/12) * 100%
Gain% = 58.33%

So, the gain% is 58.33%.