Question

Find the rate of interest when :
(i) 1200 amounts to 1320 in 2 years
(ii) *300 amounts to 400 in 2 years.
Find the time when :
(1) 1250 amounts to 1950 at 16% per annum
(it) *6540 amounts to 8447.50 at 122 per annum.
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Answer 1

b) pls see the pic for second question

a) the rate of interest will be 5% in first

the time is in first Time is 2.33 years