I'm studying the APL language and doing the exercises here: One of the questions is:
b) Add 15% to each number in the list 14 5 78 145.
I tried this:
14 5 78 145 + (14 × 15 ÷ 100) (5 × 15 ÷ 100) (78 × 15 ÷ 100) (145 × 15 ÷ 100)
I get the correct results but this is ugly since I had to write each number. The better answer is given as:
14 5 78 145 × 1.15
I could not figure out how they got 1.15? How can 1.15 work for each different number? Can you help?
Given a number N the $15\%$ of that number is given by
$$\frac{15}{100}\times N=0.15\times N$$
then
$$N+0.15\times N=1.15 \times N$$