At the Gaussian Store, puzzles cost $\$ 10$ each or $\$ 50$ for a box of 6 puzzles. If a customer would like exactly 25 puzzles, what is the minimum possible cost?
(A) $\$ 210$
(B) $\$ 230$
(C) $\$ 250$
(D) $\$ 220$
(E) $\$ 200$
If puzzles are bought individually for $\$ 10$ each, then 6 puzzles will cost $\$ 10 \times 6=\$ 60$.

Since the cost for a box of 6 puzzles is $\$ 50$, it is less expensive to buy puzzles by the box than it is to buy them individually.

Buying 4 boxes of 6 puzzles gives the customer $4 \times 6=24$ puzzles and the cost is $4 \times \$ 50=\$ 200$. Buying one additional puzzle for $\$ 10$ gives the customer 25 puzzles at a minimum cost of $\$ 210$.

ANSWER: (A)