First, the weight of 20 cans is 20 cans * 2 oz per can = <<20*2=40>>40 oz.
Thus, Jenny has the capacity to carry 100 oz - 40 oz = <<100-40=60>>60 oz of bottles.
Jenny can carry 60 oz / 6 oz per bottle = <<60/6=10>>10 bottles.
Jenny earns 10 bottles * 10 cents per bottle = <<10*10=100>>100 cents for the bottles.
Jenny earns 20 cans * 3 cents per can = <<20*3=60>>60 cents for the cans.
In total, she earns 100 cents + 60 cents = <<100+60=160>>160 cents.
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