某商場(chǎng)準(zhǔn)備在商場(chǎng)內(nèi)安裝充電式應(yīng)急照明燈，通過招標(biāo)收到3家照明燈生產(chǎn)商的投標(biāo)。該商場(chǎng)從3家生產(chǎn)商提供的應(yīng)急照明燈樣品中各隨機(jī)抽取了5個(gè)進(jìn)行檢驗(yàn)，測(cè)得各個(gè)樣品充電后可持續(xù)照明的時(shí)間長度（小時(shí)）數(shù)據(jù)如下：
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如果居民按報(bào)告期價(jià)格購買商品需多支出40萬元，報(bào)告期商品銷售額為200萬元，則價(jià)格指數(shù)為（）