Round 522,491 to the nearest ten. 522,400 522,490 522,500 522,510

522,500 is the right one

In first Lucy's week, her profits were $50, in second week her profits increased by 10% and became $55 (10% from $50 is $5), in third week her profits increased by 10% from $55 and became $60.5 (10% from $55 is $5.5) and in fourth week her profits increased by 10% from $60.5 and became $66.55 (10% from $60.5 is $6.05).
In all over four weeks she will make $50+$55+$60.5+$66.55=$232.05