Answer-
The school spent $2400 on pencils.
Solution-
Number of pencils come in cartons of pencil box = 24
Number of cartons of pencils bought by the school = 50
So,
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Price of each pencil = $2
So,
\(\text{Total cost}=\$2\ \times\ \text{Number of pencils}\\\\=\$2\ \times\ 1200\\\\=\$ 2400\)
Therefore, the school spent $2400 on pencils.