20% of 40 is 8
rate:
base:
percentage:

15% of 200 is 30
rate:
base:
percentage:

70% of 50 is 35
rate:
base:
percentage:

40 is 10% of 400
rate:
base:
percentage:

50 is 25% of 250
rate:
base:
percentage:

(pahelp nmn po)