To determine which group of numbers falls into the same equivalence class, we need to calculate the tax amount for each salary and compare the results.
Let's go through each option:
Option A: $5800; $28000; $32000
- For the first $4000, there is no tax.
- The next $1500 is taxed at 10%, which amounts to $150.
- The next $28000 is taxed at 22%, which amounts to $6160.
- The total tax is $150 + $6160 = $6310.
Option B: $0; $200; $4200
- For the first $4000, there is no tax.
- The total tax is $0.
Option C: $5200; $5500; $28000
- For the first $4000, there is no tax.
- The next $1500 is taxed at 10%, which amounts to $150.
- The total tax is $150.
Option D: $28001; $32000; $35000
- For the first $4000, there is no tax.
- The next $1500 is taxed at 10%, which amounts to $150.
- The next $28000 is taxed at 22%, which amounts to $6160.
- The total tax is $150 + $6160 = $6310.
Based on these calculations, we can see that Option A and Option D have the same total tax amount of $6310. Therefore, the correct answer is Option A.