In 1966 the operative morality rate in country was 8.1%. By 1974 it declined to 4.8% .If the rate declined by 20% from 1966 to 1970,by approximately what percentage rate declined from 1971-1974?
For percentage questions it is better to think in terms of numbers
so given information:
1966: mortality rate 81 ppl out of 1000
1974: mortality rate is 48 ppl out of 1000
in 1970 it has declined by 20% of 1966 level
i.e. level in 1970== 80*81/100
that gives a level of 64.8 ppl in 1000
so decrease from 70 to 74= 64.8-48=26.8
so percentage rate= (26.8/64.8)*100===41.3%
let us know the answer
