Think and compare to the other answered question.
Here without explanation, .
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You need to pay attention to your textbook and study.
The description is for exponential growth. Your specific problem description gives increase of 30% of the population EVERY HOUR. Your number of paramecia started as 75 organisms. The most unrefined way to find how many will be present after 12 hours, you would most obviously go about it like this:
TIME PASS HOW MANY PARAMECIUM
0 75
1 75+(0.3)(75)=97.5
2 97.5+0.3*97.5=126.6
3 75*(1.3)^3=164.8, since you should be able to see the pattern by now
4 75*(1.3)^4=214.2
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. and you can just keep on going,....
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12 75*(1.3)^12 which you can compute on your own.