2 = x%*8

2/8 = x% (divide both sides by 8)

.25 = .25*100% = 25% = x% (convert decimal fraction to %)

2 is 25% of 8.

3 = y%*10

3/10 = .3 = .30*100% = 30% = y% (divide both sides by 10, convert to %)

3 is 30% of 10.

_____

100% = 1, so multiplying by 100% doesn't change anything except the "units"

.30 = .30*100% = 30% (the equal sign remains absolutely valid throughout)

2/8 = x% (divide both sides by 8)

.25 = .25*100% = 25% = x% (convert decimal fraction to %)

2 is 25% of 8.

3 = y%*10

3/10 = .3 = .30*100% = 30% = y% (divide both sides by 10, convert to %)

3 is 30% of 10.

_____

100% = 1, so multiplying by 100% doesn't change anything except the "units"

.30 = .30*100% = 30% (the equal sign remains absolutely valid throughout)