Solve the problems on simple interest, profit-loss, and percentage.

$$\text{SI} = \frac{P \times R \times T}{100}$$

જ્યાં $P = ₹8000$, $R = 9\%$, $T = 2$ વર્ષ.

$$\text{SI} = \frac{8000 \times 9 \times 2}{100}$$ $$\text{SI} = 80 \times 9 \times 2$$ $$\text{SI} = 1440$$

સાદું વ્યાજ ₹1440 છે.

$$\text{Amount} = P + \text{SI}$$ $$\text{Amount} = 8000 + 1440$$ $$\text{Amount} = 9440$$

વ્યાજમુદ્દલ ₹9440 છે.

• નફો-ખોટ (Profit-Loss)

$$\text{Profit} = \text{Selling Price (SP)} - \text{Cost Price (CP)}$$

જ્યાં $\text{CP} = ₹1200$, $\text{SP} = ₹1350$.

$$\text{Profit} = 1350 - 1200$$ $$\text{Profit} = 150$$

નફો ₹150 છે.

$$\text{Profit Percentage} = \frac{\text{Profit}}{\text{CP}} \times 100\%$$ $$\text{Profit Percentage} = \frac{150}{1200} \times 100\%$$ $$\text{Profit Percentage} = \frac{1}{8} \times 100\%$$ $$\text{Profit Percentage} = 12.5\%$$

નફાની ટકાવારી 12.5% છે.

• ટકાવારી (Percentage)

$$\text{Percentage} = \frac{\text{Marks Scored}}{\text{Total Marks}} \times 100\%$$

જ્યાં $\text{Marks Scored} = 450$, $\text{Total Marks} = 600$.

$$\text{Percentage} = \frac{450}{600} \times 100\%$$ $$\text{Percentage} = \frac{3}{4} \times 100\%$$ $$\text{Percentage} = 75\%$$

રવિએ 75% ગુણ મેળવ્યા.

• ત્રિરાશિ (Unitary Method)

$$\text{Cost per liter} = \frac{\text{Total Cost}}{\text{Quantity}}$$ $$\text{Cost per liter} = \frac{2250}{15}$$ $$\text{Cost per liter} = 150 \text{ ₹/liter}$$

1 લિટર તેલની કિંમત ₹150 છે.

$$\text{Cost of 25 liters} = \text{Cost per liter} \times 25$$ $$\text{Cost of 25 liters} = 150 \times 25$$ $$\text{Cost of 25 liters} = 3750$$

25 લિટર તેલની કિંમત ₹3750 છે.