If the total costs of supplies for a sanitation crew are $19.98, $52.20, $12.64, and $7.79, what is the total cost?

To determine the total cost of supplies for the sanitation crew, you begin by adding all the individual costs together. The costs provided are $19.98, $52.20, $12.64, and $7.79.

When you add these amounts, proceed as follows:

1. Add the first two amounts:
   • $19.98 + $52.20 = $72.18
2. Then add the next amount:
   • $72.18 + $12.64 = $84.82
3. Finally, add the last amount:
   • $84.82 + $7.79 = $92.61

Thus, when you perform the addition correctly, the total cost comes to $92.61. This is why the choice indicating this amount is the correct answer, as it reflects the accurate sum of all the individual costs provided.

When working through such problems, attention to each step in the calculation is crucial to ensure that all figures are accounted for accurately.