Muskan buys two kg of pulses for ₹400 and sells it for ₹440. She also uses a weight of $850\text{gm}$ instead of $1\text{km}$ (or $1\text{kg}$). What is Muskan’s actual profit percentage?

Let's calculate the Cost Price (CP) and Selling Price (SP) per unit weight to find the net profit.Profit from pricing:CP of $2\text{kg}$ ($2000\text{gm}$) = ₹400 $⟹$ CP of $1000\text{gm}$ = ₹200SP of $2\text{kg}$ ($2000\text{gm}$) = ₹440 $⟹$ SP of $1000\text{gm}$ = ₹220Effect of faulty weight:She gives only $850\text{gm}$ instead of $1000\text{gm}$.The effective CP for her is the cost of $850\text{gm}$:
$$\text{Effective CP}=\frac{200}{1000}\times 850=\text{₹}170$$
The SP she gets for this quantity is the price of $1000\text{gm}$ = ₹220.Actual Profit Percentage:
$$\text{Profit}=\text{SP}-\text{Effective CP}=220-170=\text{₹}50$$
$$\text{Profit }\%=\left(\frac{\text{Profit}}{\text{Effective CP}}\right)\times 100$$
$$\text{Profit }\%=\left(\frac{50}{170}\right)\times 100=\frac{500}{17}\%=29\frac{7}{17}\%$$