***Simple and Compound Interest Shortcuts*** : ===================================== 1. Simple Interest, SI = PTR/100 2. Principal, P = 100 x SI/RT 3. Rate, R = 100 x SI/PT 4. Time, T = 100 x SI/RP 5. Amount, A = P + SI = P + (PTR)/100 6. If a certain sum of money becomes n times itself at R% p.a. simple interest in T years, then T = [(n-1)/R] x 100 years 7. If a certain sum of money becomes n times itself in T years at a simple interest, then the time T’ in which it will become m times itself is given by T = (m-1/n-1) x T years

***Simple and Compound Interest Shortcuts*** :
=====================================
1. Simple Interest, SI = PTR/100
2. Principal, P = 100 x SI/RT
3. Rate, R = 100 x SI/PT
4. Time, T = 100 x SI/RP
5. Amount, A = P + SI = P + (PTR)/100
6. If a certain sum of money becomes n times
itself at R% p.a. simple interest in T years, then
T = [(n-1)/R] x 100 years
7. If a certain sum of money becomes n times
itself in T years at a simple interest, then the
time T’ in which it will become m times itself is
given by T = (m-1/n-1) x T years