John decided to buy 10 pins for himself.  They are normally $20 each but they were on sale for 15% off.  How much did he spend on pins?
The sell reduced the price of each pin by 20*.15=$<<20*.15=3>>3
So he paid 20-3=$<<20-3=17>>17 per pin
So the total cost was 17*10=$<<17*10=170>>170
#### 170