Answer:

try doing by P×R×T / 100

Step-by-step explanation:

R is 900%

time is 3 1/2 yrs

P is 180 rs

therefore,

[tex]180 \times 900 \times 3.5 \div 100[/tex]

[tex] = 567000 \div 100[/tex]

[tex] = 5670[/tex]