( 3 / 4 ) von 100
= ( 3 / 4 ) * 100
= 3 * 100 / 4
= 300 / 4
= 75
( 11 / 15 ) von 30
= ( 11 / 15 ) * 30
= 11 * 30 / 15
= 11 * 2
= 22
( 5 / 8 ) von 10000
= ( 5 / 8 ) * 10000
= 5 * 10000 / 8
= 5 * 1250
= 6250
( 7 / 10 ) von 4000
= ( 7 / 10 ) * 4000
= 7 * 4000 / 10
= 7 * 400
= 2800