A $20,500 car is depreciating by 20% every 4 years. How much will it be worth after 3 years?
$19,387.70
$17,340.89
$10,496.00
$8,396.80

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.