Increase.
A. 120 by 15%=
B. £1280 by 20%=
C. Naria 890 in the ratio 3:2=
A. To increase 120 by 15%, we multiply 120 by 0.15 and add the result to 120.
120 + (120 * 0.15) = 138
B. To increase £1280 by 20%, we multiply 1280 by 0.20 and add the result to 1280.
1280 + (1280 * 0.20) = 1536
C. To increase Naria 890 in the ratio 3:2, we divide 890 by 2 to get the value of one part. Then multiply that value by 3 to get the increased value.
890 / 2 = 445
445 * 3 = 1335
A. To increase 120 by 15%, we need to multiply 120 by 1 plus 15% (or 0.15).
120 * (1 + 0.15) = 120 * 1.15 = 138
So, the result is 138.
B. To increase £1280 by 20%, we need to multiply 1280 by 1 plus 20% (or 0.20).
1280 * (1 + 0.20) = 1280 * 1.20 = 1536
So, the result is £1536.
C. To increase Naria 890 in the ratio of 3:2, we need to divide the amount by the sum of the parts of the ratio (3 + 2 = 5), and then multiply it by each respective part.
The first part is 3/5 of the total ratio, so:
(3/5) * 890 = 534
The second part is 2/5 of the total ratio, so:
(2/5) * 890 = 356
So, the result is 534 and 356 Naira, respectively.