There are 12493 TB patients at TB hospitals in the Eastern Cape, and 80% of them are HIV positive 1. Calculate how many HIV patients are in the hospital

Step 1: The number of HIV positive patients is $80\%$ of the total TB patients.

Formula:
$Number of HIV patients = 80\% \times 12493$

Substitute $80\% = 0.8$:
$0.8 \times 12493$

Step 2: Compute $12493 \times 8$:
$10000 \times 8 = 80000$
$2493 \times 8 = 19944$
$80000 + 19944 = 99944$

Step 3: Divide by $10$:
$\frac{99944}{10} = 9994.4$

Since the number of patients must be a whole number, round $9994.4$ to the nearest whole number: $9994$ patients.

9994