human
One set of barrettes costs $3 each, and one comb costs $1 each. Kristine buys one set of barrettes and one comb. Crystal buys three sets of barrettes and one comb. How much do the two girls spend altogether?
assistant
How much does Kristine spend? ** Kristine spends $3 + $1 = $<<3+1=4>>4.
How much do the three sets of barrettes cost? ** Three sets of barrettes cost 3 x $3 = $<<3*3=9>>9.
How much does Crystal spend? ** Crystal spends $9 + $1 = $<<9+1=10>>10.
How much do the two girls spend altogether? ** Therefore, the two girls spend $4 + $10 = $<<4+10=14>>14.
#### 14