Her cash back app gave her 10% back on $150.00 so that's .10*150 = $<<10*.01*150=15.00>>15.00 cash back
She received $15.00 from the cashback app and has a $25.00 mail-in rebate for a total of 15+25 = $<<15+25=40.00>>40.00 discounts
She spent $150.00 for the medicine and has $40.00 worth of discounts so the medicine will cost 150-40 = $<<150-40=110.00>>110.00
#### 110