A shoe box has a volume of 6176cm. It is 30.5cm long and 15.2cm wide. How tall is the shoe box?

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach