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If not mistaken I think it depends on whether they wanted a simple or compounded rate.
Based on 10%.
Simple Rate:
Quarterly
10% * 0.25 = 2.5%
Monthly
10% / 12 months = 0.833%
Compounded Rate:
Quarterly (3 months / 12 months in a year = 0.25)
1.1 ^ 0.25 –> in your BA II Plus type in 1.1 -> y^x (the button above the number 9) -> 0.25
you’ll get 1.0241 which translate to 2.41%
Monthly
1.1 ^ 0.0833 ( 1/ 12 = 0.0833)
= 1.00797
or 0.8%
For compounded rate it’s slightly more complicated because you can’t just use 10 ^ 0.25 you would need to use 1.1 instead (something like 2% = 1.02).