2. (Last month's throughput was 25% of this month's) 5000 ÷ 25%

3. (This month's processing volume is 25% less than last month) 5000× (1-25%)

4. (The quantity handled last month was 25% less than this month) 5000 \ (1-25%)

5. (This month's processing volume is 25% more than last month) 5000× (1+25%)

6. (The quantity handled last month was 25% more than this month) 5000 \ (1+25%)