Question

2) A principal of 800 amounts to 1120 in 2 years. The rate of simple interest is:
(a) 2% p.a.
(b) 16% p.a.
(c) 18% p.a.
(d) 20% p.a.
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Answer 1

Answer:

❥˙. (d) 20% p.a

Step by step explanation :-

given ,

Amount = 1120

Principal = 800

Time period = 2 years

ꜱɪᴍᴘʟᴇ ɪɴᴛᴇʀᴇꜱᴛ = ᴀᴍᴏᴜɴᴛ - ᴘʀɪɴɪᴘᴀʟ

. . = 1120 - 800

, . = 320

____________________

where ,

si = simple interest

p = principal

r = rate of interest

t = time period

t = 2 years

si = \frac{prt}{100}si=100prt

r = \frac{si \times 100}{pt}r=ptsi×100

r = \frac{320 \times 100}{800 \times 2}r=800×2320×100

r = \frac{32000}{1600}r=160032000

r = 20\%r=20%

✧ ꜱᴏ, ᴛʜᴇ ʀᴀᴛᴇ ɪꜱ 20% ✧。