To write the simplest form of the ratio of 50p to Rs 2.50, you need to express both quantities in the same units. Since 1 rupee (Rs) is equal to 100 paise (p), you can rewrite Rs 2.50 as 250 paise. Then, you can simplify the ratio:
Ratio of 50p to Rs 2.50 = (50 p)/(250 p)
Now, you can simplify this ratio by dividing both the numerator and denominator by their greatest common factor, which is 50:
(50 p)/(250 p) = (50/50) p/(250/50) p
Simplify the fractions:
(1 p)/(5 p)
So, the simplest form of the ratio of 50p to Rs 2.50 is 1:5.