First find how much more Jerry charges to pierce one person's ears than their nose: $20 * 50% = $<<20*50*.01=10>>10
Then add that amount to the cost of nose piercing to find the total cost: $10 + $20 = $<<10+20=30>>30
Then multiply that price by the number of ears he pierces to find his total earnings from ear-piercing: $30/ear * 9 ears = $<<30*9=270>>270
Then multiply the price of nose-piercing by the number of noses pierced: $20/nose * 6 noses = $<<20*6=120>>120
Then add the money from nose-piercing to the money from ear-piercing to find Jerry's total income: $120 + $270 = $<<120+270=390>>390
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