Question

Sum of a – b + ab, b + c – bc and c – a – ac is_________​

Answer 1

Answer:

ab-bc-ac

Step-by-step explanation:

a-b+ab+b+c-bc+c-a-ac

=ab-bc-ac

I hope it's helpful for you

Answer 2

Step-by-step explanation:

Compounded Annually :

P=Rs.80000

R=10% p.a.

T=1

21 years ⟹n=1+ 21

Amount for 1st year.

A=P[1+ 100R] n

=Rs.80000[1+ 100

10 ]=Rs.88000

SI on Rs. 88000 for next 1/2 year =Rs.88000× 100×10 × 21

=Rs.4400

Therefore, Amount = Rs.88000+Rs.4400 = 92400Rs.

2) Compounded half yearly :

P=Rs.80000

R=10% p.a.=5% per half year

T=1 21

years ⟹n=3

A=Rs.80000[1+ 1005 ] 3

A=Rs.92610

Thus, the difference between the two amounts = Rs.92610−Rs.92400 =Rs.210