She ordered 4 1/2 pound steaks so that's 4*.5 = <<4*.5=2>>2 pounds of steak.
The steak cost $15.00 a pound and she bought 2 pounds so that's 15*2 = $<<15*2=30.00>>30.00 for 4 steaks.
She also needed 1.5 pounds of chicken breasts at $8.00 a pound so that's 1.5*8 = $<<1.5*8=12.00>>12.00 for chicken.
The steaks cost $30.00 and the chicken cost $12.00 for a total of 30+12 = $<<30+12=42.00>>42.00 spent at the butchers.
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