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Answer:

11. P800 × 20%

= P160 (discount)

P800 - P160

= P640 (sale price)

12. P450 × 40%

= P180 (discount)

P450 - P180

= P270 (sale price)

13. P80 ÷ P320 × 100

= 25% (rate of discount)

P320 - P80

= P240 (sale price)

14. P1,275 ÷ P1,500 × 100

= 85% (rate of discount)

P1,500 - P1,275

= P225 (sale price)

15. P800 × 20%

= P160 (mark-up price)

P800 + P160

= P960 (selling price)

16. P450 × 40%

= P180 (mark-up price)

P450 + P180

= P630 (selling price)

17. P400 - P320

= P80 (mark-up price)

P80 ÷ P400 × 100

= 20% (mark-up rate)

18. P2,100 - P1,500

= P600 (mark-up price)

P600 ÷ P1,500 × 100

= 40% (mark-up rate)

19. P20,000 × 5%

= P1,000 (commission)

20. P35,000 × 15%

= P5,250 (commission)

21. P300 ÷ 2%

= P15,000 (total sales)

22. P600 ÷ P18,000 × 100

= 3.333% (rate of commission)

23. P30,000 × 5% × 2

= P3,000 (simple interest)

24. P150,000 × 6.5% × 3

= P29,250 (simple interest)

25. P16,000 / (8% × 5)

P16,000 / 0.4

= P40,000 (principal amount)