HOW TO SOLVE A QUESTION ON PARTIAL VARIATION| KCSE 2011 Q23 P2

The cost c, of producing n items varies partly as n and partly as the inverse of n. To produce two items it costs Ksh.135 and to produce three items it costs Kshs 140. Find; a) The constants proportionality and hence write the equation connecting C and n; (5marks) b) The cost of producing 10 items (2marks) c) The number of items produced at a cost of Ksh 756. (3marks)