Question 1014277
Let {{{ p }}} = the original price
{{{ p - .2p = .8p }}} = price after 1st markdown
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{{{ .8p - .25*.8p = .8p*( 1 - .25 ) }}}
{{{  .8p*( 1 - .25 ) = .75*.8*p }}} = price after 2nd markdown
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{{{ .75*.8*p - .5*.75*.8*p = .5*.75*.8*p }}} = price after 3rd markdown
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{{{  .5*.75*.8*p = .3p }}} = the final price
{{{ .3p = p - .7p }}}
70% of the original price is saved