Un comerciante compra al día 21 cajas de tomates y ordena que cada día que transcurra se compre una caja más que el día anterior. Cuantas cajas compró en total si el penúltimo día se compraron 39 cajas? a.600
b.610
c.620
d.630

answer: 20

step-by-step explanation:

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answer is because 4×10=40

and 98×4= is 392

40,392