Question

Sean was playing with his bubble wand. His bubble wand could eject 100 bubbles at once. Half of the bubbles would burst within one minute. 1/4 of the original number of the bubbles would survive for 2 minutes. Only 2% of the original number of bubbles would make it to the end of 3 minutes. All the bubbles would burst at the 4th minute. If Sean blew the bubble wand every minute, how many bubbles were there altogether at the 10th minutes?
so only the last 3 minutes count. All the bubbles in minutes 1-7 have popped.
100 * 1/2 + 100 * 1/4 + 100 * .02 = 77

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