Jenny needs to print 7*25= <<7*25=175>>175 pages.
This will cost 175*$.10 =$<<175*.10=17.5>>17.5.
The pens will cost 7*$1.50=$<<7*1.5=10.50>>10.50.
In total, she will spend $17.5+$10.5=$<<17.5+10.5=28>>28.
Since she pays with 2 twenty dollar bills she pays with 2*20=<<2*20=40>>40 dollars.
Thus, she will get $40-$28=$<<40-28=12>>12 in change.
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