In a training workshop, 3/8 of the participants were absent. 1/4 attended = morning briefing and the rest were absent. i) What fraction of the participants was absent. ii) Knowing that 10 participants attended = safety briefing, determine how many participants were enrolled in the workshop.

The total monthly budget is UGX 5,000,000.
Amount spent on purchasing materials = $40\%$ of UGX 5,000,000

$$= 0.40 \times 5,000,000 = 2,000,000 \text{ UGX}$$

Remaining budget after purchasing materials:

$$= 5,000,000 - 2,000,000 = 3,000,000 \text{ UGX}$$

Amount spent on machine maintenance = $30\%$ of the remaining budget (UGX 3,000,000)

$$= 0.30 \times 3,000,000 = 900,000 \text{ UGX}$$

Remaining budget after machine maintenance:

$$= 3,000,000 - 900,000 = 2,100,000 \text{ UGX}$$

Amount spent on safety equipment = $20\%$ of the remaining budget (UGX 2,100,000)

$$= 0.20 \times 2,100,000 = 420,000 \text{ UGX}$$

The amount spent on safety equipment is $\boxed{\text{UGX } 420,000}$.

The final remaining amount after all expenditures:

$$= 2,100,000 - 420,000 = 1,680,000 \text{ UGX}$$

The amount of money remaining after all expenditures is $\boxed{\text{UGX } 1,680,000}$.