sagotan ninyo please i brainless ko kayi pleaseeeeddd

Answer:
a) Interest- Php 4.000.00
Total amount-Php 21.000.00
b) Rate of Interest- 18%
Total Amount- Php 41.000.00
c) Principal- Php 69.720
Total Amount- Php 61.320
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a)How much is the principal in A) PHP 25.000.00
B)PHP 50.000.00
b)What is the rate of Interest in A) 9%
C)12%