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%)