Find the probability A shopping mall is having a seasonal lu

Find the probability

A shopping mall is having a seasonal lucky draw. For every purchase over $500, a customer can enter the lucky draw once. In the lucky draw, the customer draws a ball from a box containing 80 balls in comprising four different colours. Each colour represents a prize, as shown below. If the purchase is over $1000, the customer can draw two balls without replacement. If two balls are randomly drawn without replacement, find the probability of getting: One cash coupon and one gold coin. Two cash coupons with the same value. It is given that the two cash coupons have the same value; find the probability that the two cash coupons are worth $20.

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