When rounding to the nearest 10, the unit value is either rounded to 1 and added to the tens value (if value is greater than or equal to 5) or rounded to 0 (if less Than 5)
Hence, the lower limit of a number p which gives 6380 when rounded to the nearest ten would be 6375 ;
The upper limit of the number p in other to give 6380 when rounded to the nearest 10 will be 6384 (< 6385)
