No. 1.
500k diskn 15%
= 500k - (500k : 100 x 15)
= 500k - 75k
= 425k
No. 2.
450k dskn 15%
= 450k - (450k : 100 x 30 )
= 450k - 135k
= 315k
No. 3.
300k dskn 12%
= 300k - ( 300k : 100 x 12 )
= 300k - 36k
= 264k
No. 4. .... Dskn 18% = 143.500
= 100% - 18% = 82%.
82% = 143.500
= (143.5000 : 82 x 100) - 18% = 143.500
= 175k - 18% = 143.500
= 175k - (175k : 100 x 18) = 143.500 = 175k - 31.500
= 143.500