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20%-178
100%-x
20x=17800
x=890
B
45%-3375
100%-x
45x=337500
x=7500
C
63%-75,6
100%-x
63x=7560
x=120
D
87%-304,5
100%-x
87x=30450
x=350
b)7500
c)120
d)350
20/100* 178=35/6
b) 45% = 45/100
45/100*3375=1518,75
c)63%=63/100
63/100*75,6=47,628
d)87% = 87/100
87/100*304,5=264,915
ps. pamiętaj / znaczy kreske ułamkową ale inaczej napisac nie mogłem;)