.A person normally spends 70% of his income. If his income increases by 15% and the expenditure decreases by 5% what is the percentage change in his savings?

• let income is 100 rs.
  he spends 70rs.
  income increase 15 % so it becomes 115.
  spending decrease by 5 % then it becomes 65 % .
  65% of 115 is 74.75.
  then his saving is 115-74.75=40.25
  so saving is = ( 40.25-30)*100/30=34.166%
• 8 years agoHelpfull: Yes(1) No(1)
• 34.166%
  
  If initial income=x, then saving with 70% spending=x- 0.7x=0.3x
  With 15% increase in income, new income=x*115/100=1.15x and
  New saving with 5% decrease in expenditure(i.e. 65%) =1.15x - 1.15x*65/100=0.4025x
  So % change in saving=(0.4025x - 0.3x)*100/0.3x=10.25x/0.3x=102.5/3=34.166
• 8 years agoHelpfull: Yes(0) No(1)
• in 100% he spends 70% + income increses 15% + total 115%+and decreases 5% = 115%-5 %=110%
  and total 110%- 70%=40%
  his savings was= 40% only
• 8 years agoHelpfull: Yes(0) No(1)