\( 4.3 .4 \quad 8\left(4 \frac{3}{n}+3 \frac{8}{9}\right) \) 4.4. Yogut expiring in four days is placed on discount of \( 30 \% \) OFF . The original price of the jugurt is R04. Determine the price of the yogut aner the price has teduced. (3) 4 \% Caleulate the perventage increase if the price of a bus ticket increases from K60 to R84. (3) 4.6. Calculate the percentage decrease if the prise of petrol gocs down from \( R 10 \) a litre to R9. (1)

Let's solve each part of the problem step by step. ### 4.4 Yogurt Discount Calculation **Known Conditions:** - Original price of yogurt: \( R04 \) - Discount: \( 30\% \) **Step 1: Calculate the discount amount.** The discount amount can be calculated using the formula: \[ \text{Discount Amount} = \text{Original Price} \times \frac{\text{Discount Percentage}}{100} \] Substituting the values: \[ \text{Discount Amount} = 4 \times \frac{30}{100} = 4 \times 0.3 = 1.2 \] **Step 2: Calculate the reduced price.** The reduced price can be calculated as: \[ \text{Reduced Price} = \text{Original Price} - \text{Discount Amount} \] Substituting the values: \[ \text{Reduced Price} = 4 - 1.2 = 2.8 \] ### 4.5 Percentage Increase Calculation **Known Conditions:** - Original price of bus ticket: \( K60 \) - New price of bus ticket: \( R84 \) **Step 1: Calculate the increase in price.** \[ \text{Increase} = \text{New Price} - \text{Original Price} = 84 - 60 = 24 \] **Step 2: Calculate the percentage increase.** The percentage increase can be calculated using the formula: \[ \text{Percentage Increase} = \left(\frac{\text{Increase}}{\text{Original Price}}\right) \times 100 \] Substituting the values: \[ \text{Percentage Increase} = \left(\frac{24}{60}\right) \times 100 = 0.4 \times 100 = 40\% \] ### 4.6 Percentage Decrease Calculation **Known Conditions:** - Original price of petrol: \( R10 \) - New price of petrol: \( R9 \) **Step 1: Calculate the decrease in price.** \[ \text{Decrease} = \text{Original Price} - \text{New Price} = 10 - 9 = 1 \] **Step 2: Calculate the percentage decrease.** The percentage decrease can be calculated using the formula: \[ \text{Percentage Decrease} = \left(\frac{\text{Decrease}}{\text{Original Price}}\right) \times 100 \] Substituting the values: \[ \text{Percentage Decrease} = \left(\frac{1}{10}\right) \times 100 = 0.1 \times 100 = 10\% \] ### Summary of Results - **Reduced price of yogurt:** \( R2.8 \) - **Percentage increase in bus ticket price:** \( 40\% \) - **Percentage decrease in petrol price:** \( 10\% \)