a. 15/100x40=15x40/100=600/100=6
b. 11/100x60=11x60/100=660/100=6,6
c. 90/100x9=90x9/100=810/100=8,1
d. 21/100x30=21x30/100=630/100=6,3
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a. 15/100x40=15x40/100=600/100=6
b. 11/100x60=11x60/100=660/100=6,6
c. 90/100x9=90x9/100=810/100=8,1
d. 21/100x30=21x30/100=630/100=6,3