Arthur D. answered 09/06/14
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A=(1/2)bh
A=(1/2)(16)(9)
A=(8)(9)
A=72 sq cm
15%*16=2.4
b=16+2.4=18.4
6%*9=0.54
h=9+0.54=9.54
A=(1/2)(18.4)(9.54)
A=(9.2)(9.54)
A=87.768 sq cm
87.768-72.0=15.768
15.768/72=0.219=21.9% increase
another solution...
115%*72=1.15*72=82.8
106%*82.8=1.06*82.8=87.768
now find the percent of increase like before