(c) Shaun buys a smartphone on HP which costs R11 799,90. He will have to pay R639 per month for 24 months. No deposit will be required. Calculate the simple interest rate. (d) A tablet with WiFi costs R10 579. Mark buys a tablet on HP and agrees to pay a deposit of R1 500 and 36 monthly payments of R350. Calculate the total simple

To solve the problems, we will first calculate the simple interest rate for Shaun's smartphone purchase and then calculate the total simple interest for Mark's tablet purchase. ### (c) Calculate the Simple Interest Rate for Shaun's Smartphone 1. **Cost of the smartphone (Principal)**: R11,799.90 2. **Monthly payment**: R639 3. **Number of months**: 24 4. **Total amount paid**: \[ \text{Total amount paid} = \text{Monthly payment} \times \text{Number of months} = R639 \times 24 = R15,336 \] 5. **Interest paid**: \[ \text{Interest} = \text{Total amount paid} - \text{Principal} = R15,336 - R11,799.90 = R3,536.10 \] 6. **Simple Interest Formula**: \[ I = P \times r \times t \] Where: - \( I \) = Interest - \( P \) = Principal - \( r \) = Interest rate (as a decimal) - \( t \) = Time (in years) Rearranging the formula to find \( r \): \[ r = \frac{I}{P \times t} \] Here, \( t = 2 \) years (24 months). 7. **Substituting the values**: \[ r = \frac{R3,536.10}{R11,799.90 \times 2} \] \[ r = \frac{R3,536.10}{R23,599.80} \approx 0.149 \] 8. **Convert to percentage**: \[ r \approx 0.149 \times 100 \approx 14.9\% \] ### Answer for (c): The simple interest rate is approximately **14.9%**. --- ### (d) Calculate the Total Simple Interest for Mark's Tablet 1. **Cost of the tablet**: R10,579 2. **Deposit**: R1,500 3. **Monthly payment**: R350 4. **Number of months**: 36 5. **Total amount paid**: \[ \text{Total amount paid} = \text{Deposit} + (\text{Monthly payment} \times \text{Number of months}) = R1,500 + (R350 \times 36) = R1,500 + R12,600 = R14,100 \] 6. **Interest paid**: \[ \text{Interest} = \text{Total amount paid} - \text{Cost of the tablet} = R14,100 - R10,579 = R3,521 \] ### Answer for (d): The total simple interest paid by Mark is **R3,521**.