Human: The educational shop is selling notebooks for $1.50 each and a ballpen at $0.5 each. William bought five notebooks and a ballpen. How much did he spend in all? Assistant: 
How much did the notebooks cost? ** The cost of the six notebooks was 5 x $1.50 = $7.5.
How much did William spend in all? ** Therefore, William spent a total of $7.50 + $0.50 = $<<7.5+0.5=8>>8 in all.
#### 8