Mowing lawns will earn Julie 20*20 = <<20*20=400>>400 dollars
Her earnings, in dollars, from delivering newspapers will be 600 *40/100 = <<600*40/100=240>>240 dollars
After walking 24 of her neighbor’s dogs, she will earn 24* 15 = <<24*15=360>>360 dollars.
She will therefore earn a total of 400 + 240 + 360 = <<400+240+360=1000>>1000 dollars
Combining earnings from her job with her savings will give Julie 1000 + 1500 = <<1000+1500=2500>>2500 dollars
Subtracting the cost of the mountain bike from the total will leave Julie with a balance of 2500 - 2345 = <<2500-2345=155>>155 dollars
#### 155