A retailer buys an article from a wholesaler for 480 Taka and sells it to a customer for 576 Taka. The retailer makes a profit of 20%. The wholesaler also makes a profit of 20%. What was the cost pric

The retail selling price (RSP) is 576 Taka, and the retailer makes a 20% profit.
Let the retailer's cost price be $C_R$.

The retailer's cost price is the wholesaler's selling price (WSP). So, WSP = 480 Taka.

The wholesaler's selling price (WSP) is 480 Taka, and the wholesaler makes a 20% profit.
Let the wholesaler's cost price be $C_W$.

The cost price for the wholesaler is 400 Taka.

The shopkeeper sold the lentils for 2075 Taka and incurred a 5% loss.
Let the cost price be $C$.

To make a 5% profit, the selling price should be $C + 0.05 C = 1.05 C$.

Rounding to two decimal places:

The shopkeeper should sell the lentils for 2293.42 Taka to make a 5% profit.

Let's assume the shopkeeper bought 30 bananas at each rate (LCM of 10 and 15).
Cost of 30 bananas at 10 for 30 Taka:
Since 10 bananas cost 30 Taka, 30 bananas cost $3 \times 30 = 90$ Taka.
Cost of 30 bananas at 15 for 30 Taka:
Since 15 bananas cost 30 Taka, 30 bananas cost $2 \times 30 = 60$ Taka.
Total bananas bought = $30 + 30 = 60$ bananas.
Total cost price (CP) = $90 + 60 = 150$ Taka.

All 60 bananas are sold at a rate of 12 for 30 Taka.
Since 12 bananas sell for 30 Taka, 60 bananas (which is $5 \times 12$) will sell for $5 \times 30 = 150$ Taka.
Total selling price (SP) = 150 Taka.

Profit/Loss = SP - CP
Profit/Loss = $150 - 150 = 0$ Taka.
Since the profit/loss is 0, there is no profit or loss.

There will be no profit or loss.

Principal ($P$) = 2000 Taka
Time ($T$) = 5 years
Annual interest rate ($R$) = 10.50% (assuming percentage, as "10.50 Taka" for a rate is not standard)

The formula for simple interest ($I$) is:

Substitute the given values:

The interest will be 1050 Taka.

Principal ($P$) = 3000 Taka
Time ($T$) = 3 years
Initial rate ($R_1$) = 10%

Principal ($P$) = 3000 Taka
Time ($T$) = 3 years
Decreased rate ($R_2$) = 8%

Difference = $I_1 - I_2$
Difference = $900 - 720$
Difference = $180 \text{ Taka}$

The interest will be 180 Taka less.