<human>:  A chef bought 4 bags of onions. Each bag weighs 50 pounds. A pound of onions cost $1.50. How much did the chef spend?
<bot>: How much does a bag of onions cost? ** A bag of onions cost $1.50 x 50 = $<<1.5*50=75>>75.
How much did the chef spend? ** Therefore, the chef spent $75 x 4 = $<<75*4=300>>300 for the four bags of onions.
#### 300