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18. 8% , 19. 20%, 20. 6.5%
Step-by-step explanation:
18. Simple Interest = (P × R × T) / 100
64 = (800× R × 1) / 100
64 = 800R / 100
6400 = 800R
6400/800 = R
R = 8%
19.Simple Interest = (P × R × T) / 100
2000 = (10000× R × 1) / 100
2000 = 10000R / 100
200000 = 10000R
200000/10000 = R
R = 20%
20. Simple Interest = (P × R × T) / 100
48.75 = (750× R × 1) / 100
48.75 = 750R / 100
(48.75 × 100) / 750 = R
R = 6.5%
Hope it helps.
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