Arthur D. answered 02/20/16
Tutor
4.9
(338)
Mathematics Tutor With a Master's Degree In Mathematics
x=# produced before the increase
x+12%(x)=30
x+(0.12)(x)=30
1.12x=30
x=30/1.12
x=26.78 or 27 units
12%*27=0.12*27=3.24
27+3.24=30.24
26 doesn't work because 12%*26=0.12*26=3.12 and 26+3.12=29.12