Question

find the rate of interest which gives rupees 140 as interest on a sum of rupees 4200 in 5 months​

Answer 1

Answer:

ᴡᴇ ʜᴀᴠᴇ,

 ᴩ=ʀꜱ.56000,

 ᴛ=2yᴇᴀʀꜱ,

 ꜱɪ=ʀꜱ.280

 ᴡᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ,

ꜱɪ=100ᴩ×ʀ×ᴛ

280=10056000×ʀ×2

 ʀ=2×560280

 ʀ=0.25%

 ʜᴇɴᴄᴇ, ᴛʜᴇ ᴠᴀʟᴜᴇ ᴏꜰ ᴛʜᴇ ʀᴀᴛᴇ ɪꜱ 0.25%.

Answer 2

Answer:

R= I×100 / PT

140×100×12 /4200×5(as in months)

=8%