Question 1185900
**a) Percentage Increase in Muhonja's Earnings**

1. **Waweru's Initial Earnings:** Waweru's earnings increased by 10% to 7200 kshs. Let 'x' represent Waweru's initial earnings.
   * x + 0.10x = 7200
   * 1.10x = 7200
   * x = 7200 / 1.10
   * x ≈ 6545.45 kshs

2. **Muhonja's Initial Earnings:** The ratio of Waweru's to Muhonja's earnings was 4:3.
   * Muhonja's initial earnings = (3/4) * Waweru's initial earnings
   * Muhonja's initial earnings = (3/4) * 6545.45
   * Muhonja's initial earnings ≈ 4909.09 kshs

3. **Muhonja's New Earnings:** The sum of their new earnings was 15600 kshs.
   * Muhonja's new earnings = Total new earnings - Waweru's new earnings
   * Muhonja's new earnings = 15600 - 7200
   * Muhonja's new earnings = 8400 kshs

4. **Percentage Increase in Muhonja's Earnings:**
   * Percentage increase = [(New earnings - Initial earnings) / Initial earnings] * 100
   * Percentage increase = [(8400 - 4909.09) / 4909.09] * 100
   * Percentage increase ≈ 71.1%

**b) Waweru's Share of Sales Money**

1. **Total Contributed:** Waweru and Muhonja contributed their new earnings, totaling 15600 kshs.

2. **Bags of Maize Purchased:**
   * Bags purchased = Total contributed / Cost per bag
   * Bags purchased = 15600 / 1175
   * Bags purchased = 13.27 bags. Since you can't buy parts of bags, we'll use 13 bags.

3. **Total Revenue from Sales:**
   * Total revenue = Bags sold * Selling price per bag
   * Total revenue = 13 * 1762.50
   * Total revenue = 22912.50 kshs

4. **Total Profit:**
   * Profit = Total revenue - Total cost
   * Profit = 22912.50 - 15600
   * Profit = 7312.50 kshs

5. **Waweru's Share:** Waweru's share is proportional to their contribution.
   * Waweru's share = (Waweru's new earnings / Total new earnings) * Total revenue
   * Waweru's share = (7200 / 15600) * 22912.50
   * Waweru's share ≈ 10575 kshs

**Therefore:**

* **a)** Muhonja's earnings increased by approximately **71.1%**.
* **b)** Waweru received approximately **10575 kshs** from the maize sales.