1. We are asked to find Jose's commission given a sales amount and a commission rate. 2. Jose's commission is calculated as 5% of total sales. Given sales = 12690, commission = 5% \times 12690. 3. Calculate: $$\text{commission} = \frac{5}{100} \times 12690 = 0.05 \times 12690 = 634.5$$ 4. Among the choices, closest to 634.5 is ₱634.60, so the answer is A. --- 5. The next problem: Ernesto paid ₱126 in sales tax which is 12% inclusive. Find the original cost before tax. 6. Let the cost before tax be \(x\). Sales tax is 12% of this cost, so tax = 0.12 \times x. 7. Given tax = 126, so 0.12x = 126. 8. Solve for x: $$x = \frac{126}{0.12} = 1050$$ 9. Hence, the cost of the wallet is ₱1,050, choice C. --- 10. Third problem: Gina's commission allowance is ₱114.40 on sales of ₱880. Find commission rate. 11. Commission rate = (commission amount / sales) \times 100%. 12. Calculate: $$\text{rate} = \frac{114.40}{880} \times 100 = 0.13 \times 100 = 13\%$$ 13. The commission rate is 13%, so answer C.