MHB Word problem for winning percentage

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In an inter school basketball league, the team from Brent International School has won 12 out of 25 games, a winning percentage of 48%. We have seen that they need to win 89 games consecutively to raise their percentage to at least 60% . What will be their winning percentage if they win;
a. 10 games in a row?
b. 15? 20? 30? 50? 100 games?
c. Can they reach a 100% winning rate?
 
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What do you know about percentages? If you know what "100% winning rate" means, (c) is easy!)
 

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